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Home >> Lexus >> 2010 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Component Tests and General Diagnostics >> Air Conditioning System >> Back-Up Power Source Circuit
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Back-Up Power Source Circuit





AIR CONDITIONING: AIR CONDITIONING SYSTEM: Back-up Power Source Circuit
- Back-up Power Source Circuit

DESCRIPTION

This circuit supplies a back-up power source for the A/C amplifier. Power is supplied even if the ignition switch is OFF and is used for diagnostic trouble code memory, etc.

WIRING DIAGRAM





INSEPCTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (A/C)

(a) Remove the A/C fuse from the passenger side junction block.

(b) Measure the resistance of the fuse.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK WIRE HARNESS (A/C AMPLIFIER - BATTERY)





(a) Disconnect the A10 amplifier connector.

(b) Measure the voltage of the wire harness side connector.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
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