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Test 7: Stoplight Switch Circuit

  1. Check stoplights. If stoplight operation is okay, go to step 4). If stoplights do not operate correctly, check STOP fuse and replace if necessary. If fuse is okay, go to next step.
  2. Remove stoplight switch connector. Depress brake pedal (switch pin free) and ensure continuity exists between stoplight switch terminals No. 1 (Green/White wire) and No. 2 (Red/White wire).
  3. Release brake pedal (switch pin pushed in) and ensure continuity exists between stoplight switch terminals No. 3 (Green/Black wire) and No. 4 (Red/Yellow wire). If continuity is not as specified, replace stoplight switch. If continuity is as specified, check harness and connectors in stoplight circuit. Repair or replace as necessary.
  4. Perform CANCEL SWITCHES test under CRUISE CONTROL CIRCUIT FUNCTION TEST  under TROUBLE SHOOTING. If stoplight input signal is as specified, go to next trouble code displayed or appropriate TROUBLE SHOOTING BY SYMPTOM . If input signal is not as specified, go to next step.
  5. Remove CC ECU with connectors connected. Turn ignition on. Depress brake pedal. Using voltmeter positive lead, backprobe CC ECU connector terminal No. 1/STP+ (Red/White wire) and ensure battery voltage exists between CC ECU connector and ground. Using voltmeter positive lead, backprobe CC ECU connector terminal No. 16/STP- (Green/White wire) and ensure battery voltage exists between CC ECU connector and ground. If battery voltage is not present, check for open circuit between stoplight switch terminal No. 2 (Red/White wire) and CC ECU. If battery voltage is present, go to next step.
  6. Release brake pedal and repeat testing from step 5). Ensure battery voltage exists between CC ECU connector terminal No. 1/STP+ and ground. Ensure less than one volt exists between terminal No. 16/STP- and ground. If voltage is as specified, go to test for next trouble code displayed or appropriate TROUBLE SHOOTING BY SYMPTOM . If voltage is not as specified, check for open in harness and connectors between CC ECU and stoplight switch. Repair or replace as necessary. If harness and connectors are okay, replace CC ECU and retest system.
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