B2624

DTC B2624

CIRCUIT DESCRIPTION
The body control module (BCM) directly sends a reference voltage to the instrument panel (I/P) dimmer switch which is then reduced based on the I/P dimmer switch position and monitored as a signal to the BCM. The BCM uses this signal to directly control the desired level of I/P illumination lamp intensity.

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

CONDITIONS FOR SETTING THE DTC
When the BCM monitors a signal voltage of equal or greater than 4.86 Volts for more than 1 second.

ACTION TAKEN WHEN THE DTC SETS
The I/P illumination lamp dimming will not operate.

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 DTC(s) can be cleared using a scan tool.

TEST DESCRIPTION

Steps 1 - 3:

Steps 4 - 7:

Steps 8 - 13:

Steps 14 - 16:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the low voltage range.
4. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
5. Tests for a short to voltage in the signal circuit.
6. Tests for a high resistance or an open in the low reference circuit.