Trouble Code 21-Door Latch Switch (On Passenger's Side) Remains On.
Check for faulty door latch switch or shorted wire harness. Symptom includes: Passenger's shoulder anchor does not operate.
- Measure signal voltage at control unit. Turn ignition switch ON (with engine OFF). Measure signal voltage at control unit connector. Voltage should be: R43 No.10 to Body/10-13 Volts (Door closed) and R43 No.11 to Body/10-13 Volts (Door open). If okay, repair control unit terminal poor contact or replace control unit. If not okay, proceed.
- Check door latch switch. Disconnect connector from door latch switch. See Figure. Measure resistance between door latch switch terminals. Resistance should be: No.1 to No.2/1 MOhms min. (Door open) and No.1 to No.3/1 MOhms min. (Door closed). If not okay, Replace door latch switch. If okay, proceed.
- Check harness/connector between control unit and door latch switch. Disconnect connector from door latch switch. Disconnect connector from control unit. Measure resistance between control unit connector and body. Resistance should be: R43 No.10 to Body/1 MOhms min. and R43 No.11 to Body/1 MOhms min. If not okay, repair harness/connector. If okay, repair control unit terminal poor contact or replace control unit.