Brake Pedal Position Switch Signal Circuit Troubleshooting
Brake Pedal Position Switch Signal Circuit TroubleshootingNOTE: Before troubleshooting, check the No.47 STOP (20 A) fuse in the under-hood fuse/relay box.
1. Turn the ignition switch ON (II).
2. Check the BRAKE SWITCH in the DATA LIST with the HDS
Does it indicate OFF?
YES - Go to step 3.
NO - Inspect the brake pedal position switch.
3. Press the brake pedal, and check the BRAKE SWITCH in the DATA LIST with the HDS.
Is it ON?
YES - The brake pedal position switch signal circuit (BKSW Line) is OK.
NO - Go to step 4.
4. Release the brake pedal.
5. Turn the cruise control master switch ON.
6. Check the CRUISE BRK SW in the DATA LIST with the HDS.
Does it indicate ON?
YES - Go to step 7.
NO - Go to step 16.
7. Press the brake pedal, and check the CRUISE BRK SW in the DATA LIST with the HDS.
Is it OFF?
YES - Go to step 8.
NO - Go to step 26.
8. Inspect the brake pedal position switch.
Is it OK?
YES - Go to step 9.
NO - Replace or adjust the switch, and recheck.
9. Turn the ignition switch OFF.
10. Jump the SCS line with the HDS.
11. Disconnect under-hood fuse/relay box 7P connector.
12. Disconnect the taillight connectors.
13. Disconnect PCM connector B (56P).
14. Check for continuity between PCM connector terminal B39 and body ground with the brake pedal pressed.
Is there continuity?
YES - Repair short in the wire between the PCM (B39) and under-hood fuse/relay box.
NO - Go to step 15.
15. Check for continuity between PCM connector terminal B39 and under-hood fuse/relay box connector terminal No.5 with the brake pedal pressed
Is there continuity?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Repair open in the wire between the PCM (B39) and under-hood fuse/relay box, and recheck.
16. Test the cruise control master switch.
Is it OK?
YES - Go to step 17.
NO - Replace the cruise control master switch, and recheck.
17. Turn the ignition switch OFF.
18. Jump the SCS line with the HDS.
19. Disconnect the cruise control master switch 8P connector.
20. Disconnect PCM connector B (56P).
21. Check for continuity between PCM connector terminal B38 and body ground
Is there continuity?
YES - Go to step 24.
NO - Go to step 22.
22. Connect the cruise control master switch 8P (5P*) connector terminal No.4 (No.2*) to body ground with a jumper wire.
23. Check for continuity between PCM connector terminal B38 and body ground.
Is there continuity?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Repair open in the wire at the PCM (B38) and cruise control master switch, and recheck.
24. Disconnect the brake pedal position switch connector (4P).
25. Check for continuity between PCM connector terminal B38 and body ground.
Is there continuity?
YES - Repair short in the wire (WHT/RED) between the PCM (B38) and the brake pedal position switch.
NO - Repair short in the wire (LT GRN) between the brake pedal position switch and the cruise control master switch connector terminal No.4.
26. Inspect the brake pedal position switch.
Is it OK?
YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If symptom/indication goes away with a known-good PCM, replace the original PCM.
NO - Replace or adjust the switch, and recheck.