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Headlight Switch Input Failure

NOTE: Perform EXTERIOR LIGHT TEST 1A  before proceeding with this test. For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION. Perform VERIFICATION TEST: VER-2A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Ensure headlight switch is in OFF position. Using scan tool, select SENSORS. Read headlight switch voltage. If scan tool displays HEADLIGHT SWITCH VOLTAGE: 5 volts, go to next step. If scan tool does not display HEADLIGHT SWITCH VOLTAGE: 5 volts, go to EXTERIOR LIGHT TEST 2B .
  2. Disconnect headlight switch 13-pin connector. Connect jumper wire between terminals No. 6 (White wire) and No. 12 (Yellow wire) on headlight switch harness connector. Read headlight switch voltage. If scan tool displays HEADLIGHT SWITCH VOLTAGE: 0.0 volts, replace headlight switch. If scan tool does not display HEADLIGHT SWITCH VOLTAGE: 0.0 volts, go to next step.
  3. Remove jumper wire. Connect jumper wire between ground and terminal No. 12 (Yellow wire) on headlight switch 13-pin harness connector. Read headlight switch voltage. If scan tool displays HEADLIGHT SWITCH VOLTAGE: 0.0 volts, go to step  5. If scan tool does not display HEADLIGHT SWITCH VOLTAGE: 0.0 volts, go to next step.
  4. Disconnect Body Control Module (BCM) Black 24-pin connector C2. BCM is mounted to junction block located behind left end cap of instrument panel. See Figure.
  5. Disconnect Body Control Module (BCM) Black 24-pin connector C2. BCM is mounted to junction block located behind left end cap of instrument panel. See Figure.
  6. Remove BCM from junction block. Inspect internal 20-pin connector. Repair as needed. If connector is okay, replace BCM.
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