DTC B1275, B1276, B1278: Combination Light Switch OFF Position Circuit Malfunction; Combination Light Switch Parking (SMALL) Position Circuit Malfunction; Combination Light Switch ON Position Circuit Malfunction

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Turn the combination light switch to the PARKING and ON (low beam) positions for at least 6 seconds in each position, and then to the OFF position.
Check for DTCs with the HDS.
Is DTC B1275, B1276, or B1278 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
Select LIGHTING from the BODY ELECTRICAL system select menu, and enter DATA LIST.

Check each combination light switch position value with the DATA LIST menu.

When the combination light switch is turned OFF:

DATA LIST TABLE

Data List	Value
Headlight Switch (OFF)	ON
Headlight Switch (PARKING)	OFF
Headlight Switch (HEADLIGHT)	OFF

When the combination light switch is turned to PARKING (SMALL):

DATA LIST TABLE

Data List	Value
Headlight Switch (OFF)	OFF
Headlight Switch (PARKING)	ON
Headlight Switch (HEADLIGHT)	OFF

When the combination light switch is turned ON (HEADLIGHT):

DATA LIST TABLE

Data List	Value
Headlight Switch (OFF)	OFF
Headlight Switch (PARKING)	ON
Headlight Switch (HEADLIGHT)	ON

Are all data list values correct?

YES - Faulty MICU; replace the under-dash fuse/relay box:

For USA models (see USA MODELS )
For Canada models (see CANADA MODELS )

NO - Go to step 7.

Turn the ignition switch to LOCK (0).
Disconnect the combination light switch 12P connector.
Turn the ignition switch to ON (II).
Select LIGHTING from the BODY ELECTRICAL system select menu, and enter DATA LIST.

Check each combination light switch position value with the DATA LIST menu.

When the combination light switch is turned OFF:

DATA LIST TABLE

Data List	Value
Headlight Switch (OFF)	OFF
Headlight Switch (PARKING)	OFF
Headlight Switch (HEADLIGHT)	OFF

Are all data list values indicated OFF?

YES - Go to step 15.

NO - Go to step 12.

Turn the ignition switch to LOCK (0).
Disconnect under-dash fuse/relay box connector M (34P).
Check for continuity between under-dash fuse/relay box connector M (34P) terminals No. 5, No. 7, and No. 8 and body ground individually.
Is there continuity?

YES - Repair a short to ground in the wires.

NO - Faulty MICU; replace the under-dash fuse/relay box:
- For USA models (see USA MODELS )
- For Canada models (see CANADA MODELS )
Fig 1: Checking Continuity Between Under-Dash Fuse/Relay Box Connector M (34P) Terminals 5, 7, 8 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Do the combination light switch test (see COMBINATION LIGHT SWITCH TEST/REPLACEMENT ).
Is the combination light switch OK?

YES - Go to step 17.

NO - Replace the combination light switch.
Disconnect under-dash fuse/relay box connector M (34P).

Check for continuity between under-dash fuse/relay box connector M (34P) terminals and the combination light switch 12P connector terminals as shown:

CONNECTOR TERMINAL REFERENCE TABLE

Under-dash fuse/ relay box connector M (34P)	Combination light switch 12P connector
5	10
7	11
8	9
33	12

Is there continuity?

YES - Go to step 19.

NO - Repair open in the wires.

Fig 2: Checking Continuity Between Under-Dash Fuse/Relay Box Connector M (34P) Terminals & Combination Light Switch 12P Connector Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Check for continuity between under-dash fuse/relay box connector M (34P) terminals as shown:

CONTINUITY REFERENCE TABLE

From terminal	To terminal
8	3, 4, 7, 5
7	3, 4, 5

Is there continuity?

YES - Repair short between the wires.

NO - Faulty MICU; replace the under-dash fuse/relay box:

For USA models (see USA MODELS )
For Canada models (see CANADA MODELS )