Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Check compressor.
PREPARATION:
1. Check compressor drive belt tension (See DRIVE BELT ).
2. Check if the compressor does not lock during operation with engine started and blower switch and A/C switch ON.
1. NG: Adjust drive belt tension or repair compressor.
2. OK: Go to Next Step.
Check compressor lock sensor.
PREPARATION:

Disconnect compressor connector.

CHECK:

Measure resistance between terminals 1 and 2 of compressor lock sensor connector.

OK:
1. Resistance: 65 - 125 Ω at 20°C (68°F)
Fig 1: Measuring Resistance Between Terminals 1 And 2 Of Compressor Lock Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace compressor.
2. OK: Go to Next Step.
Check harness and connector between compressor lock sensor and ECM (See HOW TO PROCEED WITH TROUBLESHOOTING ).
1. NG: Repair or replace harness or connector.
2. OK: Go to Next Step.
Check harness and connector between ECM and A/C amplifier (See HOW TO PROCEED WITH TROUBLESHOOTING ).
1. NG: Repair or replace harness or connector.
2. OK: Go to Next Step.
Check voltage between terminals ACLD of ECM and body ground.
PREPARATION:

Remove ECM with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. A/C switch ON.
3. Measure voltage between terminals ACLD of ECM and body ground.
OK:
1. Voltage: Below 1.0 V
Fig 2: Checking Voltage Between Terminals ACLD Of ECM And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Check and replace ECM.
2. OK: Check and replace A/C amplifier.