1996 ACURA RL KA9 ignition

Cavity Wire
Test condition

Test: Desired result
Possible cause if result is not obtained

6

5

4

2

3

1

7
YEL/BLK

YEL

PNK/BLU

GRN

RED/WHT

BLK

WHT
Jump to ground

Ignition switch ON (II)

Jump to ground

Jump to ground

Jump to ground

Under all conditions

Under all conditions
The horn should sound.

Check for voltage to ground:

There should be battery voltage.

The trunk should open.

The doors should unlock.

If all doors are closed, the doors

should lock.

Check for continuity to ground:

There should be continuity.

Check for voltage to ground:

There should be battery voltage.
• Blown No. 44 (20 A) fuse in the

under-hood fuse/relay box

• Faulty multiplex control unit

(passenger's)

• Faulty horn

• An open in the wire

• Blown No. 13 (7.5 A) fuse in the

under-dash fuse/relay box

• An open in the wire

• Blown No. 44 (20 A) fuse in the

under-hood fuse/relay box

• Faulty multiplex control unit

(passenger's)

• Faulty trunk lid opener

• An open in the wire

• Blown No. 44 (20 A) fuse in the

under-hood fuse/relay box

• Faulty multiplex control unit

(passenger's)

• An open in the wire

• Blown No. 44 (20 A) fuse in the

under-hood fuse/relay box

• Faulty multiplex control unit

(passenger's)

• An open in the wire

• Poor ground (G602)

• An open in the wire

• Blown No. 44, (20 A) fuse in the

under-hood fuse/relay box

• An open in the wireProCarManuals.com

Cavity Wir eTest conditio nTest: Desire d resul tPossibl e caus e if resul t i s no t obtaine d
1
8
7
13
1 1
1 5
4
4
1 4
3
12
BL K
GRN/WH T
WHT/BLK
BLU/WH T
YEL/GRN
BLU/OR N
BLU/GRN
BLU/GR N
BLU/ORN
RED
GR N
Unde r al l condition s
Unde r al l condition s
Ignitio n switc h O N (II )
Ignitio n switc h O N (II ) an d
driver' s windo w switc h
UP
Ignitio n switc h O N (II ) an d
driver' s windo w switc h
AUT O U P
Ignitio n switc h O N (II ) an d
driver' s windo w switc h
AUT O DOW N
Ignitio n switc h O N (II ) an d
driver' s windo w switc h
DOWN
Driver' s windo w switc hDOWN
Driver' s windo w switc hOFF
Driver' s windo w switc hOFF
Connec t th e batter ypower t o th e No . 1 2an d No . 3 terminal s
Connec t th e batter y
power t o th e No . 3 an dNo. 1 2 terminal s
Check fo r continuit y t o ground :
Ther e shoul d b e continuity .
Chec k fo r voltag e to ground :
Ther e shoul d b e batter y voltage .
Chec k fo r voltag e to ground :
Ther e shoul d b e batter y voltage .
Chec k fo r voltag e to ground :
Ther e shoul d b e batter y voltage .
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity .
Chec k fo r continuit y betwee n th e No . 4
an d No . 1 4 terminals :
Ther e shoul d b e continuity .
Chec k fo r continuit y betwee n th e No . 4
an d No . 1 4 terminals :
Ther e shoul d b e continuity .
Chec k th e driver' s windo w motor :
I t shoul d ru n (th e windo w move s
down) .
Chec k th e driver' s windo w motor :
I t shoul d ru n (th e windo w move s up) . •
Poo r groun d (G251 )
• A n ope n in th e wir e
• Blow n No . 4 1 (2 0 A ) fus e in th e under -
hoo d fuse/rela y bo x
• A n ope n in th e wir e
• Blow n No . 1 7 (7. 5 A ) [No . 2 3 (7. 5 A) ] fus e
i n th e under-das h fuse/rela y bo x
• Fault y powe r windo w rela y
• A n ope n in th e wir e
• Fault y powe r windo w maste r switc h
• A n ope n in th e wire
• Fault y powe r windo w maste r switc h
• Poo r groun d (G251 )
• A n ope n in th e wir e
• Fault y powe r windo w maste r switc h
• A n ope n in th e wir e
• Fault y powe r windo w moto r
• A n ope n in th e wir e
Reconnec t th e connecto r t o th e powe r windo w contro l unit .
Cavit y Wir eTest conditio nTest: Desire d resul tPossibl e caus e if resul t i s no t obtaine d
17
9
5
16
GRN/YE L
YEL/BLU
GRN/RE D
YEL/WHT
Ignition switc h O N (II )
Whil e operatin g th e driv -
er' s windo w switc h
Whil e operatin g th e driv -
er' s windo w switc h Chec
k fo r voltag e betwee n th e No . 1 7
an d No . 9 terminals :
Ther e shoul d b e batter y voltage .
Chec k fo r puls e voltag e betwee n th e
No . 5 an d No . 9 terminals :
Ther e shoul d b e puls e voltag e (th e
voltmete r needl e shoul d mov e bac k
an d fort h alternately) .
Chec k fo r puls e voltag e betwee n th e
No . 1 6 an d No . 9 terminals :
Ther e shoul d b e puls e voltag e (th e
voltmete r needl e shoul d mov e bac k
an d fort h alternately) . •
Fault y powe r windo w moto r
• Fault y pulse r
• A n ope n in th e wir e
ProCarManuals.com

OnStar System ('02 Model USA)

OnStar Control Unit Input Test (cont'd)

Disconnect the connectors from the unit

Cavity Wire Test condition
Test: Desired result
Possible cause if result is not obtained

B17

B22

A32

B6

B3

B2

B9

B18

B32
WHT/YEL

WHT

BLK

ORN

RED/GRN

BLK
Under all conditions

Ignition switch in ACC

(I)

Under all conditions

Under all conditions

Under all conditions

Under all conditions
Check for voltage to ground:

There should be battery voltage.

Check for voltage to ground:

There should be battery voltage.

Check for continuity to ground:

There should be continuity.

Connect to ground:

All horns should sound.

Connect to ground:

The taillights should come on.

Check for continuity to ground:

There should be continuity.
• Blown No. 56 (7.5 A) fuse in the

under-hood fuse/relay box

• An open in the wire

• Blown No. 4 (10 A) fuse in the

under-dash fuse/relay box

• An open in the wire

• Poor ground (G601)

• An open in the wire

• Blown No. 39 (15 A) fuse in the

under-hood fuse/relay box

• Faulty horn relay

• Either horn faulty

• Poor ground (G201)

• An open in the wire

• Blown No. 1 (15 A) fuse in the

under-dash fuse/relay box

• Faulty taillight relay

• Faulty taillight system

• An open in the wire

• An open in the wire

Reconnect the connectors to the unit

Cavity Wire
Test condition
Test: Desired result
Possible cause if result is not obtained

B20

B5

A8

A25

A10

A11

A23

A24
GRN/WHT

GRN/RED

GRY

BRN/YEL

WHT

BLU/RED

BLK

WHT
Front passenger's door

lock key cylinder in neu-

tral position

Front passenger's door

lock key cylinder in

locked position

Front passenger's door

lock key cylinder in neu-

tral position

Front passenger's door

lock key cylinder in

unlocked position

Under all conditions

Under all conditions

OnStar "DOT" button

pushed and human

advisor voice comes

on.

OnStar "DOT" button

pushed and human

advisor voice comes

on.

Under all conditions

Ignition switch in ACC

(I). OnStar "DOT" but-

ton pushed. Speak into

the microphone.
Check for voltage to ground:

There should be battery voltage.

Check for voltage to ground:

There should be less than 1 V.

Check for voltage to ground:

There should be battery voltage.

Check for voltage to ground:

There should be less than 1 V.

Check for continuity to ground:

There should be continuity.

Check for continuity to ground:

There should be continuity.

Check for voltage between the A10

terminal and audio unit C9 or B2

terminal:

There should be 1 V or less.

Check for voltage between the A11

terminal and audio unit C8 or B3

terminal:

There should be 1 V or less.

Check for continuity to ground:

There should be continuity.

Check for voltage to ground:

There should be about 4 V.
• Faulty front passenger's door lock

key cylinder switch

• Poor ground (G401, G402)

• An open in the wire

• Short to ground (if you don't have

5 V when you should)

• An open in the wire

• An open in the wire

• Faulty audio unit

• Faulty speaker

• An open in the wire

• Faulty audio unit

• Faulty speaker

• An open in the wire

• Faulty OnStar buttons and microphone

• An open in the wire

• Faulty OnStar buttons and micro-

phone

• An open in the wireProCarManuals.com

Reconnect the connectors from the unit

Cavity Wire Test condition

Test: Desired result
Possible cause if result is not obtained

B21

B24

B25

B29

B7

B10

B11

B12

B13

A1

A18

A19

A7

A22

A3

A4

A21

A20

A6

A5
BLU

PUR

ORN

ORN

BLU

BLK

ORN

GRN

PUR

GRY

GRY

GRY

YEL

GRY

BRN

BRN

GRY

GRY

YEL

YEL
Ignition switch in ACC (I)

Ignition switch turned

OFF

It is made to move to the

malfunction mode of

onstar system

Ignition switch in ACC (I)

Under all conditions

Ignition switch in ACC (I)

Ignition switch in ACC (I)

OnStar "DOT" button

pushed

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Under all conditions

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed

Ignition switch in ACC (I)

OnStar "Emergency" but-

ton pushed
Check for voltage to ground:

There should be no voltage.

Check for voltage to ground:

There should be 10 V.

Check for voltage to ground:

There should be 4 V.

Check for voltage to ground:

There should be less than 1 V.

Check for continuity to ground:

There should be continuity.

Check for voltage to ground:

There should be about 8 V.

Check for voltage to ground:

There should be about 8 V.

Check for voltage to ground:

There should be about 8 V.

Check for voltage to ground:

There should be about 8 V.

Check for voltage to ground:

"DOT" button pushed: 280 mV

"OnStar" button pushed: 1 V

"Emergency" button pushed: 1.7 V

Check for voltage to ground:

There should be about 10 V.

Check for voltage to ground:

There should be about 7 V.

Check for continuity to ground:

There should be continuity.

Check for voltage to ground:

There should be about 0 V.

Check for voltage to ground:

There should be about 3.8 V.

Check for voltage to ground:

There should be about 6.6 V.

Check for voltage to ground:

There should be about 0 V.

Check for voltage to ground:

There should be 1 V or less.

Check for voltage to ground:

There should be 1 V or less.

Check for voltage to ground:

There should be about 3 V.

Check for voltage to ground:

There should be about 6 V.
• Faulty OnStar button system interface

unit

• An open in the wire

• Faulty OnStar button system interface

unit

• An open in the wire

• Faulty OnStar button system interface unit

• An open in the wire

• Faulty OnStar button system interface unit

• Poor ground (G401, G402)

• An open in the wire

• Faulty OnStar button system interface unit

• An open in the wire

• Faulty OnStar button system interface

unit

• An open in the wire

• Faulty OnStar button system interface unit

• An open in the wire

• Faulty OnStar button system interface unit

• An open in the wire

• Faulty OnStar button system interface

unit

• An open in the wire

• Blown No. 56 (7.5 A) fuse in the under-

hood fuse/relay box

• An open in the wire

• Blown No. 4 (10 A) fuse in the under-

dash fuse/relay box

• An open in the wire

• Poor ground (G601)

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wire

• Faulty OnStar button and microphone

• An open in the wireProCarManuals.com

Disconnect the connectors from the unit

Cavity Wire Test condition

Test: Desired result
Possible cause if result is not obtained

A1

A7
BLK

Under all conditions

Check for continuity to ground:

There should be continuity.
• An open in the wire

Reconnect the connectors from the unit

Cavity Wire Test condition

Test: Desired result
Possible cause if result is not obtained

B2

B3

B4

B5

A12

A3

A9

A6

A10

A8

A5

A2

A4

B13

B14
BLU/YEL

YEL/GRN

ORN

WHT/GRN

BLU

PUR

ORN

ORN

BLU

BLK

ORN

GRN

PUR

PNK

GRN
Ignition switch in ACC (I)

Ignition switch in ACC (I)

With the ignition switch

OFF, press and hold the

"DOT" button. Turn the

ignition switch from OFF

to ACC three times and

back to ACC, then release

the "DOT" button.

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch turned

OFF

With the ignition switch

OFF, press and hold the

"DOT" button. Turn the

ignition switch from OFF

to ACC three times and

back to ACC, then release

the "DOT" button.

Ignition switch in ACC (I)

Under all conditions

Ignition switch in ACC (I)

Ignition switch in ACC (I)

OnStar "DOT" button

pushed

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I)

Ignition switch in ACC (I) On-

Star "DOT" button pushed

Ignition switch in ACC (I)
Check for voltage to ground:

There should be approx 8V.

Check for voltage to ground:

"DOT" button pushed: 280mV

"OnStar" button pushed: 1V

"Emergency" button pushed: 1.7V

Check for voltage to ground:

There should be 4V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be no voltage.

Check for voltage to ground:

There should be 10V.

Check for voltage to ground:

There should be 4V.

Check for voltage to ground:

There should be less than 1V.

Check for continuity to ground:

There should be continuity.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

"DOT" button pushed: 280mV

"OnStar" button pushed: 1V

"Emergency" button pushed: 1.7V

Check for voltage to ground:

There should be about 8V.

Check for voltage to ground:

There should be about 4V.
• Blown No. 56 (7.5 A) fuse in the

under-hood fuse/relay box

• An open in the wire

• Faulty OnStar button

• An open in the wire

• Faulty OnStar button

• An open in the wire

• Faulty OnStar button

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• Poor ground (G401, G402)

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• Faulty audio unit

• An open in the wire

• Faulty SRS unit

• An open in the wireProCarManuals.com

Disconnect the connector from the unit

Cavity Wire Test condition
Test: Desired result
Possible cause if result is not obtained

12

23
BRN

GRY
Under all conditions

Under all conditions
Check for continuity to ground:

There should be continuity.

Check for continuity to ground:

There should be continuity.
• An open in the wire

• An open in the wire

Reconnect the connectors from the unit

Cavity Wire Test condition
Test: Desired result

Possible cause if result is not obtained

22

21

25

20

15

14

11

8

2
GRY

GRY

YEL

YEL

GRY

GRY

BRN

GRY

YEL
Ignition switch in ACC

(I)

Ignition switch in ACC

(I)

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed

Ignition switch in ACC (I)

OnStar "Emergency"

button pushed
Check for voltage to ground:

There should be about 10 V.

Check for voltage to ground:

There should be about 7 V.

Check for voltage to ground:

There should be about 6 V.

Check for voltage to ground:

There should be about 3 V.

Check for voltage to ground:

There should be 1 V or less.

Check for voltage to ground:

There should be 1 V or less.

Check for voltage to ground:

There should be about 6.6 V.

Check for voltage to ground:

There should be about 3.8 V.

Check for voltage to ground:

There should be about 0 V.
• Blown No. 56 (7.5 A) fuse in the

under-hood fuse/relay box

• An open in the wire

• Blown No. 4 (10 A) fuse in the

under-dash fuse/relay box

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• An open in the wire

• Faulty OnStar button and micro-

phone

• An open in the wire

• An open in the wire

• An open in the wireProCarManuals.com

Engine Coolant Temperature (ECT) Sensor

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0116: A range/performance problem in the

Engine Coolant Temperature (ECT) sensor.

The ECT Sensor is a temperature dependent resistor (thermistor). The resistance of the thermistor decreases as the engine

coolant temperature increases as shown below.

NOTE: If DTC P0117 and/or P0118 are stored at the same time as DTC P0116 and/or P0125, troubleshoot those DTCs first,

then troubleshoot DTC P0116 and/or P0125.

Possible Cause

• ECT sensor deterioration

• Malfunction in the thermostat and the cooling system

Troubleshooting Flowchart

— The MIL has been reported on.

— DTC P0116 is stored.

Problem verification:

1. Turn the ignition switch OFF.

2. Check the ETC output tempera-

ture or voltage with the HDS or

the scan tool.

Is about 176°F (80°C) or high-

er, or 0.86 V or less indicated?

YES

Problem verification:

1. Note current coolant

temperature.

2. Turn the ignition switch OFF.

3. Cool the engine for 1 hour.

4. Check the ETC output temper-

ature or voltage with the HDS

or the scan tool.

Does the ECT change 3.6°F

(2°C) or more?

NO

Replace the ECT sensor.
NO

YES
Problem verification:

1. Note current coolant

temperature.

2. Start the engine. Hold the

engine speed at 3,000 rpm

with no load (in Park or neu-

tral)
until
the
radiator
fan

comes on, then let it idle.

3. Check the ETC output temper-

ature or voltage with the HDS

or the scan tool.

Does the ECT change 3.6°F

(2°C) or more?
NO

YES

Intermittent failure, system is OK

at this time. Check the thermo-

stat and the cooling system.

Intermittent failure, system is OK

at this time. Check the thermo-

stat and the cooling system.

(cont'd)ProCarManuals.com

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0134: Right Primary Heated Oxygen Sensor

(Right Primary HO2S) (Bank 1, Sensor 1) heater system malfunction.

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0154: Left Primary Heated Oxygen Sensor

(Left Primary H02S) (Bank 2, Sensor 1) heater system malfunction.

The MIL has been reported on.

DTC P0134 and/or P0154 are

stored.

Problem verification:

1. Do the PCM Reset Procedure.

2. Start the engine. Hold the

engine at 3,000 rpm with no

load (in Park or neutral) until

the
radiator
fan
comes
on.

Is DTC P0134 and/or P0154

indicated?

YES

Check for an open in the HO2S:

1. Turn the ignition switch OFF.

2.
Disconnect
the
right primary

H02S (Bank 1, Sensor 1) or left

primary HO2S* (Bank2, Sen-

sor 1) connector.

3. Install a jumper wire on the

harness side of the right prima-

ry H02S (Bank 1,Sensor 1) or

left primary H02S*connector

between terminals No. 1 and

No. 2.

4. Turn the ignition switch ON (II).

5. Check the right primary HO2S

(Bank 1, Sensor 1) or left pri-

mary HO2S*(Bank2, Sensorl)

output voltage with the HDS

or the scan tool.

Is there 1.5 V or more?

YES

Check for an open in the wires

(PHO2S line):

1. Turn the ignition switch OFF.

2. Install a jumper wire on the

PCM connector between D19,

orD18*andD22.

3. Turn the ignition switch ON (II).

4. Check the right primary H02S

(Bank 1, Sensor 1) or left pri-

mary H02S* (Bank 2, Sensor 1)

output voltage with the HDS

or the scan tool.

Is there 1.5 V or more?

YES
NO
Intermittent failure, system is OK

at this time. Check for poor con-

nections or loose terminals at

C251, C254 (located at right shock

tower), C119 (right primary H02S

(Bank 1, Sensor 1)) or C126 (left

primary H02S (Bank 2, Sensor 1))*

and
PCM.

Replace the HO2S.

Repair open in the wire between

PCM (019 or D18*) and right pri-

mary HO2S (Bank 1, Sensor 1) or

left primary HO2S* (Bank 2,

Sensor 1).

Substitute a known-good PCM and

recheck. If symptom/indication

goes away, replace the original

PCM.ProCarManuals.com