NTC-15A: Checking Brake Switch
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
. For circuit identification and wiring diagram, see WRANGLER
wiring diagram in WIRING DIAGRAMS article.
- Disconnect brake switch connector. Clean and/or repair connector as necessary. Perform TEST VER-2A. Using an ohmmeter, check resistance between ground and brakelight switch connector, ground circuit. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
- Turn ignition off. Reconnect brake switch connector. Turn ignition on, with engine off. Ensure brake pedal is not pressed. Using a 12-volt test light connected to ground, backprobe brake switch connector, B+ circuit. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open B+ circuit. Perform TEST VER-2A.
- Turn ignition off. Disconnect brake switch connector. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of brake switch sense circuit between brake switch connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open brake switch sense circuit. Perform TEST VER-2A.
- Ensure ignition is off. Ensure brake switch connector is still disconnected. Reconnect PCM connector. Connect a jumper wire between ground and brakelight switch connector, brake switch sense circuit. Using scan tool, read brake switch status. If scan tool displays RELEASED, replace brake switch. Perform TEST VER-2A. If scan tool does not display RELEASED, go to next step.
- Check brake switch adjustment. Adjust brake switch as necessary. Perform TEST VER-2A. If brake switch adjustment is okay, go to next step.
- At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.