LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 1994 >> T100 Base >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Circuit Testing >> Test No. 6, Stoplight Switch

Test No. 6, Stoplight Switch

  1. Check stoplight operation. If stoplight system operates properly, go to step 9). If stoplight system does not operate properly, remove and inspect STOP fuse. If STOP fuse is okay, go to step 4). If fuse is blown, replace fuse. Recheck system operation. If fuse fails again, go to next step. If fuse does not fail again, and system is operating properly, test is complete.
  2. Disconnect CC ECU connector. See Figure. Replace STOP fuse. Recheck system operation. Remove and inspect STOP fuse. If fuse is okay, go to next step. If fuse fails again, locate and repair short in wiring harness between stoplight switch and STOP fuse.
  3. Depress brake pedal. Remove and inspect STOP fuse. If fuse is okay, replace CC ECU and recheck system operation. If fuse is blown, locate and repair short in wiring harness between stoplight switch and stoplights or between CC ECU and stoplights.
  4. Ensure stoplight switch is installed properly. See STOPLIGHT SWITCH  under ADJUSTMENTS. Adjust switch as necessary and recheck system operation. If switch is adjusted properly, disconnect 4-pin stoplight switch connector and go to next step.
  5. Measure voltage between ground and terminal No. 2 of stoplight switch connector (wiring harness side). To identify terminal No. 2 wire color, see IDENTIFYING STOPLIGHT SWITCH TERMINAL NO . 2 table. If battery voltage is present, go to next step. If battery voltage is not present, locate and repair open in wiring harness between STOP fuse and stoplight switch connector.
    IDENTIFYING STOPLIGHT SWITCH TERMINAL NO. 2

    Application Wire Color
    T100 GRN/RED
  6. Connect a jumper wire between stoplight switch connector terminals No. 1 (Green/White wire) and No. 2. To identify terminal No. 2 wire color, see IDENTIFYING STOPLIGHT SWITCH TERMINAL NO . 2 table. Check stoplights. If lights are on, go to next step. If lights are off, locate and repair open in wiring harness between stoplight switch connector and stoplights.
  7. Check stoplight switch. See STOPLIGHT SWITCH  under COMPONENT TESTING. Replace switch as necessary and recheck system operation. If switch is okay, reconnect stoplight switch connector. Disconnect CC ECU connector. See Figure. Measure voltage between ground and CC ECU connector terminal No. 1. See Figure. If battery voltage is present, go to next step. If battery voltage is not present, locate and repair open in wiring harness between CC ECU connector and STOP fuse.
  8. With brake pedal depressed, measure voltage between ground and CC ECU connector terminal No. 16. See Figure. If battery voltage is present, replace CC ECU and recheck system operation. If battery voltage is not present, locate and repair open in wiring harness between stoplight switch connector and CC ECU connector.
scientia non olet · About LEMON Manuals