Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Check voltage between terminal IG and GND of A/C amplifier connector.
PREPARATION:

Remove the A/C amplifier with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Measure voltage between terminals IG and GND of A/C amplifier.
OK:

Voltage: Battery positive voltage

Fig 1: Identifying Terminal IG And Gnd Of A/C Amplifier Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
2. NG : Go to next step.
Check continuity between terminal GND of A/C amplifier and body ground.
CHECK:

Measure resistance between terminal GND of A/C amplifier and body ground.

OK:

Resistance: 0 Ω (continuity)

Fig 2: Identifying Terminal Gnd Of A/C Amplifier And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Repair or replace harness or connector.
2. OK : Go to next step.
Check RR A/C fuse.
PREPARATION:

Remove RR A/C fuse from luggage room J/B.

CHECK:

Check continuity of RR A/C fuse.

OK:

Continuity exists

Fig 3: Identifying RR A/C Fuse
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Check for short in all the harness and components connected to the RR A/C fuse.
2. OK : Check and repair harness and connector between A/C amplifier and battery.