B2623

B2623 - Display Dimming PWM Input Circuit High

Schematic:

CIRCUIT DESCRIPTION
Display dimming is controlled by the body control module (BCM) based on input received from the dimming potentiometer. The dimming potentiometer is connected between circuit 1359 and circuit 1381. The BCM monitors these inputs and provides a pulse width modulated (PWM) output at circuit 8 to operate the display lamps.

DTC PARAMETERS
- Circuit 1359 shorted-to-battery voltage or open
- Voltage or circuit greater than 4.71 volts
- No telltale illumination

DIAGNOSTIC AIDS
- Check for poor connection at the BCM. Inspect harness connectors for backed-out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals and poor terminal-to-wire connection (terminal crimped over wire insulation and not conductors).
- Inspect wiring harness for damage. Check for broken or chaffed insulation.
- Check for poor connection at the dimming potentiometer.
- If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.

TEST

Diagnostic Chart: