Mirror Adjust Manual Switch Circuit (LS400)
- Remove tilt and telescopic ECU, located behind dash, near steering column. Do not disconnect harness connectors. Using DVOM, backprobe DVOM positive lead to ECU harness connector terminal No. 1 (Brown/Red wire) and connect DVOM negative lead to ECU harness connector terminal No. 4 (Light Green wire). See WIRING DIAGRAMS .
- Turn ignition on. Check voltage with switch in different positions. See MIRROR ADJUST MANUAL SWITCH CIRCUIT TEST table. If voltage in all switch positions are within range, diagnose using appropriate MULTIPLEX CONTROL SYSTEMS article. If voltage in certain switch positions are out of range or not as specified, replace side mirror switch. If voltage in all positions are out of range, check power mirror switch. See appropriate heading under TESTING . Replace switch as necessary. If switch is okay, go to next step.
- Check harness and connectors between tilt and telescopic ECU and side mirror adjust manual switch. See WIRING DIAGRAMS . Repair or replace harness as necessary. If harness and connectors are okay, replace tilt and telescopic ECU.
MIRROR ADJUST MANUAL SWITCH CIRCUIT TEST
| Switch Position | Voltage |
|---|---|
| Off | 4.7 Or Greater |
| Up | 1.35-1.65 |
| Down | 3.03-3.57 |
| Left | 3.62-4.18 |
| Right | 2.35-2.85 |