Checking Components and Wiring

Checking Components And Wiring







- Ignition off
- Check that the stop lamp switch is correctly installed.

Check the resistance of the stop lamp switch with the switch pressed in and with the switch released. Take readings between terminals #1 and #5 (component side) on the stop lamp switch.

HINT: The stop lamp switch must be closed when the brake pedal is depressed. The resistance of the stop lamp switch must be infinite when the brake pedal is unaffected.

Check the stop lamp switch and engine control module (ECM) connectors. Check for contact resistance and oxidation.

Check the cable between stop lamp switch terminal #5 (wiring side) and engine control module (ECM) terminal #B26 (#B36). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

Check central electronic module (CEM) connector B. Check for contact resistance and oxidation.

Check the cable between stop lamp switch terminal #5 (wiring side) and central electronic module (CEM) terminal #4B. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

Remedy as necessary.

Other information:
- Checking wiring and terminals
- For resistance values, see Component specifications
- To connect the breakout box, see Connecting the breakout box
- For information about signals on 5 cylinder engines, see Signal specification
- For information about signals on 6 cylinder engines, see Signal specification
- To access or replace the central electronic module (CEM), see Central electronic module (CEM), replacing.

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