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.
Conditions for Setting the DTC
| • | Circuit 1359 is shorted to battery voltage or open. |
| • | The voltage is greater than 4.71 volts. |
| • | No light will illuminate in the I/P. |
| • | Circuit 1381 is short to battery voltage or open. |
Diagnostic Aids
| • | Check for a poor connection at the BCM. Inspect the harness connectors
for backed-out terminals, improper terminal mating, broken connector locks, improperly
formed or damaged terminals, and poor terminal-to-wire connection (the terminal crimped
over wire insulation and not conductors). |
| • | Inspect the wiring harness for damage. Check for broken or chaffed insulation. |
| • | Check for a poor connection at the dimming potentiometer. |
| • | If a fault is suspected to be intermittent, wiggling the harness wiring
may help in locating the fault. |
