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Home >> Toyota >> 1997 >> 4Runner Base, 4WD, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Cruise Control System - 3.4L) >> Circuit Testing >> Test 7: Stoplight Switch Circuit
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Test 7: Stoplight Switch Circuit

WARNING: This page is about a different variant/trim than selected.
  1. Check stoplight operation. If stoplight operation is okay, go to next step. If stoplights do not operate correctly, check STOP fuse and replace if necessary. If fuse is okay, go to next step.
  2. Perform CANCEL SWITCHES test under CRUISE CONTROL FUNCTION TEST  under TROUBLE SHOOTING. If stoplight input signal is as specified, go to next trouble code displayed or appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  under TROUBLE SHOOTING. If input signal is not as specified, remove CC ECU with connector connected. Turn ignition switch to ON position.
  3. Using voltmeter positive lead, backprobe CC ECU connector C17 terminal No. 16/STP- (Green/White wire) and ensure battery voltage exists between CC ECU connector C17 and ground with brake pedal depressed. Ensure less than one volt exists between terminal No. 16/STP- (Green/White wire) and ground with brake pedal released.
  4. If voltage is as specified, go to test for next trouble code displayed or appropriate symptom under TROUBLE SHOOTING BY SYMPTOM  under TROUBLE SHOOTING. 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, check CC ECU. See PIN VOLTAGE TESTS . If found to be defective, replace CC ECU and retest system.
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