2006 ACURA CSX headlight


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DTC B1078:
YES
NO
YES
NO YES
NO
22-157
DTC Troubleshooting
UNDER-DASH FUSE/RELAY BOX CONNECTOR E (42P)
GND (BLK)
UNDER-DASH FUSE/RELAY BOX CONNECTOR F (34P) GND (BLK)
GND (BLK)
Daytime Running Lights System
Error
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-93).
1. Turn the ignition switch to ON (II).
2. Pull the parking brake lever.
3. Clear the DTCs with the HDS.
4. Release the parking brake lever.
5. Turn the ignition switch to LOCK (0), and then back to ON (II).
6. Check for DTCs with the HDS.
Go to step 7.
Intermittent failure. The daytime running
lights system is OK at this time. Check for loose or
poor connections.
7. Turn the headlight switch ON (high beam).
Go to step 8.
Go to step 10.
8. Turn the ignition switch to LOCK (0). 9. Measure the voltage between under-dash fuse/
relay box connector E (42P) terminals No. 6 and
No. 33 and body ground, and between under-dash
fuse/relay box connector F (34P) terminal No. 20
and body ground individually.
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Repair an open in the BLK wire or poor
ground (G 401, G501, G601, G602).
10. Turn the ignition switch to LOCK (0) and turn the headlight switch OFF.
(cont’d)
Wire side of female terminalsWire side of female terminals
Is DTC B1078 indicated?
Do bot h head l i ght s ( hi gh beam) come on? I s t her e l ess t han 0.5 V ?
08/08/21 14:26:56 61SNR030_220_0159
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DYNOMITE -2009-



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YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
22-158Exterior Lights
DTC Troubleshooting (cont’d)
UNDER-DASH FUSE/RELAY BOX CONNECTOR F (34P)
BRH/L(HI)(WHT)
RIGHT HEADLIGHT (HIGH BEAM) 2P CONNECTOR B R H/L (HI) (WHT) UNDER-DASH FUSE/RELAY BOX CONNECTOR G (21P)
LEFT HEADLIGHT (HIGH BEAM) 2P CONNECTOR B L H/L (HI) (PNK)
B L H/L (HI) (PNK)
HEADLIGHT (HIGH BEAM) 2P CONNECTOR GND (BLK)
11. Check the No. 12, No. 13, and No. 18 fuses in theunder-dash fuse/relay box.
Go to step 12.
Replace the blown fuse and recheck. If the
No. 18 (20 A) fuse is blown again, replace the
under-dash fuse/relay box. If the No. 12 (10 A) or
No. 13 (10 A) fuse is blown again, repair a short in
the wire between the under-dash fuse/relay box
and appropriate headlight (high beam).
12. Check the headlight bulbs.
Go to step 13.
Replace the faulty bulb.
13. Disconnect under-dash fuse/relay box connectors F (34P) and G (21P).
14. Disconnect the both headlight (high beam) 2P connectors.
15. Check for continuity between right headlight (high beam) 2P connector terminal No. 2 and under-dash
fuse/relay box connector F (34P) terminal No. 22.
Go to step 16.
Repair an open in the wire between the right
headlight (high beam) and the under-dash fuse/
relay box. 16. Check for continuity between left headlight (high
beam) 2P connector terminal No. 2 and under-dash
fuse/relay box connector G (21P) terminal No. 15.
Go to step 17.
Repair an open in the wire between the left
headlight (high beam) and the under-dash fuse/
relay box.
17. Check for continuity between headlight (high beam) 2P connector terminal No. 1 and body
ground.
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Repair an open in the BLK wire or poor
ground (G 201-right side, G301-left side).
Wire side of female terminals
Wire side of female terminals Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Ar e al l f uses OK ? Ar e t he head l i ght bul bs OK ?
Is there continuity? Is there continuity?
Is there continuity?
08/08/21 14:26:57 61SNR030_220_0160
ProCarManuals.com
DYNOMITE -2009-

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DTC B1275:
DTC B1276:
DTC B1278:
YES
NO
When the combination light switch is turned OFF
When the combination light switch is turned to
PARKING (SMALL) When the combination light switch is turned ON
(HEADLIGHT)
YES
NO
When the combination light switch is turned OFF
YES
NO
22-159
Combination Light Switch OFF
Position Circuit Malfunction
Combination Light Switch
Parking (SMALL) Position Circuit Malfunction
Combination Light Switch ON
Position Circuit Malfunction
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-93).
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Turn the combination light switch to the PARKING (SMALL), and ON (low beam) positions for 6
seconds in each position, and then to the OFF
position.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for loose or poor connections.
5. Select LIGHTING from the BODY ELECTRICAL system select menu, and enter DATA LIST.
6. Check each combination light switch position value with the DATA LIST menu.
Data List Value
Headlight Switch (OFF) ON
Headlight Switch (PARKING) OFF
Headlight Switch (HEADLIGHT) OFF
Data List Value
Headlight Switch (OFF) OFF
Headlight Switch (PARKING) ON
Headlight Switch (HEADLIGHT) OFF Data List Value
Headlight Switch (OFF) OFF
Headlight Switch (PARKING) ON
Headlight Switch (HEADLIGHT) ON
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the combination light switch 12P connector.
9. Turn the ignition switch to ON (II).
10. Select LIGHTING from the BODY ELECTRICAL system select menu, and enter DATA LIST.
11. Check each combination light switch position value with the DATA LIST menu.
Data List Value
Headlight Switch (OFF) OFF
Headlight Switch (PARKING) OFF
Headlight Switch (HEADLIGHT) OFF
Go to step 15.
Go to step 12.
(cont’d)
I s DT C B12 7 5 , B12 7 6, or B12 7 8 i nd i cat ed ? Are all data list values correct?
Are all data list values indicated OFF?
08/08/21 14:26:57 61SNR030_220_0161
ProCarManuals.com
DYNOMITE -2009-

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DTC B1279:
YES
NO
When the passing switch is operated
When the headlight switch is turned ON, and the
dimmer switch changed from low beam to high
beam
YES
NO When the combination light switch is turned OFF
YES
NO
YES
NO
22-161
UNDER-DASH FUSE/RELAY BOX CONNECTOR S (20P)
DIMMER SW
(LT BLU)
H/L ON
SW (PNK)
PASSING
SW (RED)
Headlight Switch DIMMER
Position Circuit Malfunction
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-93).
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Turn the combination light (headlight) switch ON.
4. Change the dimmer switch from low beam to high beam.
5. Turn the combination light switch OFF, and then to the passing position, and wait for at least 6 seconds.
6. Check for DTCs with the HDS.
Go to step 7.
Intermittent failure, the system is OK at this
time. Check for loose or poor connections.
7. Select LIGHTING from the BODY ELECTRICAL system select menu, then enter DATA LIST.
8. Check each combination light switch position value with the DATA LIST menu.
Data List Value
Headlight Switch (PASSING) ON
Headlight Switch (High beam) OFF
Data List Value
Headlight Switch (PASSING) OFF
Headlight Switch (High beam) ON
Headlight Switch (HEADLIGHT) ON
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Go to step 9. 9. Turn the ignition switch to LOCK (0).
10. Disconnect the combination light switch 12P connector.
11. Turn the ignition switch to ON (II).
12. Select LIGHTING from the BODY ELECTRICAL system select menu, then enter DATA LIST.
13. Check each combination light switch position value with the DATA LIST menu.
Data List Value
Headlight Switch (PASSING) OFF
Headlight Switch (High beam) OFF
Headlight Switch (HEADLIGHT) OFF
Go to step 17.
Go to step 14.
14. Turn the ignition switch to LOCK (0).
15. Disconnect under-dash fuse/relay box connector S (20P).
16. Check for continuity between body ground and under-dash fuse/relay box connector S (20P)
terminals No. 11, No. 12, and No. 16 individually.
Repair a short to ground in the wire.
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
(cont’d)
Wire side of female terminals
Is DTC B1279 indicated?
Are all data list values correct? Are all data list values indicated OFF?
Is there continuity?
08/08/22 16:38:06 61SNR030_220_0163
ProCarManuals.com
DYNOMITE -2009-

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22-163
MICU Input Test
UNDER-DASH FUSE/RELAY BOX CONNECTOR E (42P)
BLK RED
GRN WHT
ORN
PNKPUR
WHT
GRY LT BLU UNDER-DASH FUSE/RELAY BOX CONNECTOR F (34P)
UNDER-DASH FUSE/RELAY BOX CONNECTOR G (21P)
UNDER-DASH FUSE/RELAY BOX CONNECTOR S (20P) UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P) BLK
BLK BLK
RED
RED
RED ORN
PNK BLK
NOTE:
 The MICU turns on the headlights (high beams) in a dimming mode for the Daytime Running Lights under the following conditions:
– With the ignition switch turned to ON (II)
– The headlight switch OFF
– The parking brake is released (parking brake switch OFF)
 The DRL indicator will come on when one of the headlight (high beams) bulbs is blown, or if the high beam wiring has an open circuit with the daytime running lights ON.
 If the vehicle is equipped with an optional remote control engine start system, the daytime running lights will not function when started with the remote start.
1. Before testing the lighting system, troubleshoot the system using B-CAN System Diagnosis Test Mode A (see page 22-93).
2. Check the No. 12 (10 A), No. 13 (10 A), No. 15 (7.5 A), No. 16 (15 A) , (10 A) , No. 17 (15 A) , (10 A) , No. 18 (20 A), No. 19 (15 A), No. 21 (30 A) , (20 A) , and No. 37 (7.5 A) fuses in the under-dash fuse/relay box. If any fuse
is blown, replace it and go to step 3.
1: With HID
2: Without HID
3. Disconnect under-dash fuse/relay box connectors E, F, G, S, and T. NOTE: All connector views are shown from wire side of female terminals.
(cont’d)
1212
12
08/08/21 14:26:58 61SNR030_220_0165
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DYNOMITE -2009-

Cavity Wire Test conditionTest: Desired result Possible cause if desired result
is not obtained
22-164Exterior Lights
MICU Input Test (cont’d)
4. Inspect the connector and socket terminals to be sure they are all making good contact.
 If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
 IftheterminalslookOK,gotostep5.
5. With the connector still disconnected, do these input tests at the following connectors.  If any test indicates a problem, find and correct the cause, then recheck the system.
 If all the input tests prove OK, go to step 6.























E19 RED Under all conditions Connect battery power to terminal
E19:
The taillights, rear side marker
lights, and license plate lights
should come on.Poor ground (G701)
Blown bulb
An open in the wire
F3 RED Under all conditions Connect battery power to terminal F3:
The right front side marker light
and right front parking light
should come on.Poor ground (G201)
Blown bulb
An open in the wire
F4 GRN Under all conditions Connect battery power to terminal F4:
The right headlight (low beam)
should come on.Poor ground (G201)
Blown bulb
Faulty HID unit
An open in the wire
F22 WHT Under all conditions Connect battery power to terminal F22:
The right headlight (high beam)
should come on.Poor ground (G201)
Blown bulb
An open in the wire
G5 RED Under all conditions Connect battery power to terminal G5:
The left front side marker light
and left front parking light should
come on.Poor ground (G301)
Blown bulb
An open in the wire
G15 PNK Under all conditions Connect battery power to terminal G15:
The left headlight (high beam)
should come on.Poor ground (G301)
Blown bulb
An open in the wire
G17 PUR Under all conditions Connect battery power to terminal G17:
The left headlight (low beam)
should come on.Poor ground (G301)
Blown bulb
Faulty HID unit
An open in the wire
: With HID
08/08/21 14:26:58 61SNR030_220_0166
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DYNOMITE -2009-

Cavity WireTest condition Test: Desired result Possible cause if desired result is not
obtained
22-165
6. Reconnect the connectors to the under-dash fuse/relay box, and do these input tests at the following connectors.
 If any test indicates a problem, find and correct the cause, then recheck the system.
 If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box.


































G2 ORN Under all conditions Measure the voltage between
terminal G2 and body ground:
There should be battery voltage.Blown No. 23 (10 A) fuse in the under-
hood fuse/relay box
An open in the wire
G18 WHT Under all conditions Measure the voltage between terminal G18 and body ground:
There should be battery voltage.Blown No. 4 (50 A) fuse in the under-
hood fuse/relay box
An open in the wire
E6 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G602)
An open in the wire
E33 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G601)
An open in the wire
F20 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G401)
An open in the wire
T34 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.Poor ground (G501)
An open in the wire
S1 ·
S5 ORN
·
BLK Combination light switch OFF Measure the voltage between
terminals S1 and S5:
There should be less than 1 V. Faulty combination light switch
An open in the wire
Combination light switch in any
other position than OFF Measure the voltage between
terminals S1 and S5:
There should be more than 5 V. Faulty combination light switch
A short to ground in the wire
S11 ·
S5 PNK
·
BLK Combination light switch
(Headlight position) ON
Measure the voltage between
terminals S11 and S5:
There should be less than 1 V. Faulty combination light switch
An open in the wire
Combination light switch OFF Measure the voltage between terminals S11 and S5:
There should be more than 5 V. Faulty combination light switch
A short to ground in the wire
S12 ·
S5 RED
·
BLK Combination light switch lever
pulled (Passing)
Measure the voltage between
terminals S12 and S5:
There should be less than 1 V. Faulty combination light switch
An open in the wire
Combination light switch lever
released from passing position Measure the voltage between
terminals S12 and S5:
There should be more than 5 V. Faulty combination light switch
A short to ground in the wire
S13 ·
S5 GRY
·
BLK Combination light switch
(SMALL position) ON
Measure the voltage between
terminals S13 and S5:
There should be less than 1 V. Faulty combination light switch
An open in the wire
Combination light switch OFF Measure the voltage between terminals S13 and S5:
There should be more than 5 V. Faulty combination light switch
A short to ground in the wire
S16 ·
S5 LT BLU
·
BLK Combination light switch
(Dimmer) in high beam position
Measure the voltage between
terminals S16 and S5:
There should be less than 1 V. Faulty combination light switch
An open in the wire
Combination light switch
(Dimmer) in low beam position Measure the voltage between
terminals S16 and S5:
There should be more than 5 V. Faulty combination light switch
A short to ground in the wire
C3 ORN Ignition switch ON (II) Measure the voltage between terminal C3 and body ground:
There should be battery voltage.Faulty ignition switch
An open in the wire
08/08/21 14:26:58 61SNR030_220_0167
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DYNOMITE -2009-

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22-167
Light switch
Turn signal switchPosition
469
1011 12
1212
Headlight
switch
Passing
switch OFF
ON
OFF HIGHLOW
LEFT
RIGHT
Neutral Terminal
Position Terminal
Fog light switch (TYPE S and ’08 PREMIUM and ’09 models) Position Terminal
ON
OFF 12
8
5. Inspect the connector terminals to be sure they are all making good contact.
 If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
 If the terminals look OK, check for continuity between the terminals in each switch position according to thetables.
– If the continuity is not as specified, replace the switch.
08/08/21 14:26:59 61SNR030_220_0169
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