B0951

DTC B0951

CIRCUIT DESCRIPTION
The body control module (BCM) controls the illumination dimming of all of the control switch indicators. The BCM sets the control switch indicator illumination level according to the instrument panel (I/P) dimmer switch signal received when the component is activated and the indicator is ON. The BCM also activates the headlamp on indicator.

Voltage for the LED dimming signal, instrument panel lamps dimming control, as well as the backlight lamps control circuits is from the TBC 3 fuse 16 in the underhood fuse block directly through the BCM to these circuits.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B0951 Headlamps On Indicator Circuit

CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9.0-16.0 volts.

CONDITIONS FOR SETTING THE DTC
- The headlamp on indicator control circuit is open, shorted to ground, or shorted to battery positive voltage.
- The LED dimming signal circuit is open, shorted to ground, or shorted to battery positive voltage.
- The backlight lamps control circuit is shorted to ground.
- The instrument panel lamps dimming control circuit is shorted to ground.
- There is a loss of the underhood fuse block TBC 3 battery supply voltage to the BCM for 1 second.

DIAGNOSTIC AIDS
- Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
- A short to ground in the following circuits will cause the TBC 3 fuse to open.
- The backlight lamps control.
- The instrument panel lamps dimming control.
- The LED dimming signal.
- Battery positive voltage from the underhood fuse block TBC 3 fuse.
- An open in the TBC 3 fuse will cause the BCM to set the following DTC:
- B0951
- B2610
- B2625

ACTION TAKEN WHEN THE DTC SETS
The headlamps on indicator will remain ON with the headlamps OFF.
The headlamps on indicator will remain OFF with the headlamps ON.

CONDITIONS FOR CLEARING THE MIL/DTC
- This DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- History and current DTCs can be cleared using a scan tool.

TEST DESCRIPTION

Step 1 - Step 12:

Step 13 - Step 16:

The numbers below refer to the step numbers on the diagnostic table.
9. Determines if it is the headlamp on indicator circuit or the BCM.
10. Determines if it is the headlamp on indicator circuit or the BCM.
15. After replacement of the BCM you must calibrate the new module for proper operation.