Inspection Procedure
WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
HINT
Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.
- INSPECT FUSE (ECU-IG LH)
- Remove the ECU-IG LH fuse from the cowl side junction block LH
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
STANDARD RESISTANCE SPECIFICATIONSTester Item Condition Specified Condition ECU-IG LH fuse Always Below 1 Ω
NG: REPLACE FUSE (ECU-IG LH)
OK: Go to next step
- INSPECT A/C AMPLIFIER (IG+ - GND)
- Remove the A/C amplifier with its connectors still connected.
- Turn the engine switch on (IG)
- Measure the voltage according to the value(s) in the table below
Standard Voltage
STANDARD VOLTAGE SPECIFICATIONSTester Connection Switch Condition Specified Condition J58-21 (IG+) - J58-20 (GND) Engine switch on (IG) 11 to 14 V
NG: Go to step 3
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
- CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)
- Disconnect the A/C amplifier connector
- Measure the voltage according to the value(s) in the table below
Standard Voltage
STANDARD VOLTAGE SPECIFICATIONSTester Connection Switch Condition Specified Condition J58-21 (IG+) - Body ground Engine switch off Below 1 V Engine switch on (IG) 11 to 14 V
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
STANDARD RESISTANCE SPECIFICATIONSTester Connection Condition Specified Condition J58-20 (GND) - Body ground Always Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE A/C AMPLIFIER (See REMOVAL )
- Measure the resistance according to the value(s) in the table below.