Relay Circuit
- Disconnect combination switch and wiper relay, and check wiring harness continuity. With ignition switch in OFF or ACC position, check voltage between known good ground and terminal No. 2 of 10-pin connector. No voltage should exist. With ignition on, battery voltage should exist. If battery voltage exists, go to next step. If voltage readings are not as specified, check and repair affected circuit(s).
- Check continuity between terminal No. 6 of 20-pin connector and terminal No. 3 of 10-pin connector. See Fig 1. If continuity exists, go to next step. If continuity does NOT exist, check and repair affected circuit(s).
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Check continuity between terminal No. 12 of 20-pin connector and terminal No. 4 of 10-pin connector. If continuity exists, go to next step. If continuity does NOT exist, check and repair affected circuit(s).
- Check continuity between terminal No. 4 of 20-pin connector and terminal No. 5 of 10-pin connector. If continuity exists, go to next step. If continuity does NOT exist, check and repair affected circuit(s).
- Check continuity between terminal No. 14 of 20-pin connector and terminal No. 8 of 10-pin connector. See Fig 1. If continuity exists, go to next step. If continuity does NOT exist, check and repair affected circuit(s).
- Check continuity between terminal No. 8 of 20-pin connector and terminal No. 10 of 10-pin connector. If continuity exists, go to next step. If continuity does NOT exist, check and repair affected circuit(s).
- Check continuity between known good ground and terminal No. 7 of 10-pin connector. If continuity exists, all switch circuits are okay. If continuity does NOT exist, check and repair affected circuit(s).