B2625

DTC B2625

Circuit Description

The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the dimming lamps to a desired intensity. When this occurs, the BCM directly sends a pulse width modulated (PWM) voltage based on the I/P dimmer switch position on the light emitting diode (LED) dimming supply circuit, controls illumination lamps dimming control circuit, and the instrument panel lamps dimming supply voltage circuit.

Voltage for the LED dimming supply circuit, controls illumination lamps dimming control circuit, and the instrument panel lamps dimming supply voltage circuit is from the TBC 2A fuse in the instrument panel (I/P) fuse block directly through the BCM to these circuits.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit

Conditions for Running the DTC

The battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

* The controls illumination lamps dimming control circuit is shorted to ground.
* The LED dimming supply circuit is shorted to ground.
* There is a loss of the I/P fuse block TBC 2A fuse battery supply voltage to the BCM for one second.

Action Taken When the DTC Sets

All dimming lamps will not illuminate or the control switch ON/OFF indicators will not illuminate.

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.

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 2A fuse to open.

- The controls illumination lamps dimming control.
- Battery positive voltage from the I/P fuse block TBC 2A fuse.

* An open in the TBC 2A fuse will cause the BCM to set the following DTCs:

- B0951
- B2610
- B2625

Test Description

Step 1 - Step 5:

The number below refers to the step number on the diagnostic table.
4. After replacement of the BCM you must calibrate the new module for proper operation.