Parking Brake Switch Circuit: Procedure
- CHECK BRAKE WARNING LIGHT
- Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.
OK
The brake warning light operates as specified above.
NG → See step 3
OK: Go to next step
- Check that the brake warning light comes on when the parking brake is applied and goes off when it is released.
- CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY)
- Disconnect the E4 radio and display receiver assembly connector.
- Disconnect the A27 parking brake switch assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition E4-6 (PKB) - A27-1 Always Below 1 Ω E4-6 (PKB) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 4
- GO TO BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE