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Brake Switch Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAM.
  1. Ensure brakelights are functioning properly. If brakelights are not working okay, repair as necessary. Perform TEST VER-1A. If brakelights are okay, go to next step.
  2. Using scan tool, monitor BRAKE SW input while applying and releasing brake pedal. If scan tool properly displays brake switch input state, system is operating properly at this time. Perform TEST VER-1A. If scan tool does not properly display brake switch input, go to next step.
  3. Disconnect CAB 37-pin connector. Inspect, clean or repair connector as necessary. Turn ignition on. Using scan tool in voltmeter mode, check voltage on CAB connector terminal No. 22 (White/Tan wire) with brake pedal applied. If battery voltage is present, replace CAB. Perform TEST VER-1A. If battery voltage does not exist, go to next step.
  4. Turn ignition off. Disconnect stoplight switch connector. Inspect, clean or repair connector as necessary. Connect a jumper wire between chassis ground and stoplight switch terminal No. 5 (White/Tan wire). Using scan tool in ohmmeter mode, check resistance of CAB connector terminal No. 22 (White/Tan wire). If resistance is more than 5 ohms, repair open in White/Tan wire. Perform TEST VER-1A. If resistance is less than 5 ohms, replace stoplight switch. Perform TEST VER-1A.
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