1996 ACURA RL KA9 open hood

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

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

Thermostat

The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P1486: Range/Performance Problem in

Thermostat.

NOTE: If the DTCs listed below are stored at the same time as DTC P1486, troubleshoot those DTCs first, then recheck for

P1486.

P0107, P0108, P1128, P1129: MAP Sensor

P2227, P2228, P2229: Barometric Pressure Circuit

P1259, P1279: VTEC system

P0401: EGR Flow Insufficient

P0404: EGR Valve Lift Insufficient

P0406: EGR Valve Position Sensor High Voltage

P0125, P0116, P0117, P0118: Engine Coolant Temperature Circuit

P0112, P0113: Intake Air Temperature Circuit

P0345, P0349, P1336, P1337: CKP Sensor 1/2

P0300: Random Misfire

P0301, P0302, P0303, P0304, P0305, P0306: Cylinder 1, 2, 3, 4, 5 or 6 Misfire detected.

P0506, P0507: Idle Control System Malfunction

P0511: Idle Air Control Valve

DTC P1486 can set occasionally when the hood is opened.

Troubleshooting

— The MIL has been reported on.

— DTC P1486 is stored.

1. Turn the ignition Switch OFF.

2. Check the engine coolant

level.

Is the engine coolant level low?

Does the radiator fan keep

running?

YES

Check the radiator fan circuit,

radiator fan switch circuit and

the radiator fan switch.

It they are OK, substitute the

PCM and recheck.

If the symptom/indication goes

away, replace the original PCM.
Refill the engine coolant. If neces-

sary, check the cooling system.

Test the thermostat.
Check for the radiator for circuit:

1. Turn the ignition switch ON

(II).

2. Check the radiator fan.ProCarManuals.com

Electrical Troubleshooting

Troubleshooting Flowchart — A/T Clutch Pressure Control Solenoid Valve

• OBD II Scan Tool indicates Code

P0748.

• Self-diagnosis indicator light

indicates Code 16.

Measure A/T clutch pressure con-

trol solenoid valve Resistance at

Solenoid Connector:

1. Disconnect the shift solenoid

valve/A/T clutch pressure con-

trol solenoid valve harness 4P

connector.

2. Measure the resistance of the

A/T clutch pressure control

solenoid valve.

Is the resistance approx. 5 ?

YES

Check A/T Clutch Pressure

Control Solenoid Valve for a

Short Circuit:

1. Disconnect the E (26P) con-

nector from the PCM.

2. Check for continuity between

body ground and the E16 termi-

nal and E3 terminal individually.

Is there continuity?

NO

Measure A/T Clutch Pressure

Control Solenoid Valve Resistance:

1. Connect the shift solenoid

valve/A/T clutch pressure con-

trol solenoid valve harness 4P

connector.

2. Measure the resistance

between the E16 and E3 ter-

minals.

Is the resistance approx. 5 ?

YES

Check the VB SOL Voltage:

1. Disconnect the A (26P) and E

(26P) connectors from the

PCM.

2. Turn the ignition switch ON (II).

3. Measure the voltage between

the E1 and A26 terminals.

Is there voltage?

YES

Check for loose PCM connectors.

If necessary, substitute a known-

good PCM and recheck.
Possible Cause

• Disconnected A/T clutch pres-

sure control solenoid valve con-

nector

• Short or open in A/T clutch

pressure control solenoid valve

wire

• Faulty A/T clutch pressure con-

trol solenoid valve

• Open VB SOL line

Replace the A/T clutch pressure

control solenoid valve.

Repair short in the wires

between the E16 and E3 termi-

nals and the A/T clutch pressure

control solenoid valve.

Repair loose terminal or open in

the wires between the E16 and E3

terminals and the A/T clutch pres-

sure control solenoid valve.

Check for open in the wire

between the E1 terminal and the

under-hood fuse/relay box.ProCarManuals.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

B12

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