Rear A/C

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.

SYMPTOM SUSPECT AREA

Symptom	Suspect Area	See Section
Whole functions of the rear A/C system does not operate	Rear A/C amplifier ACC power source circuit	- ACC POWER SOURCE CIRCUIT
Air Flow Control: No blower operation	ACC power source circuit Rear A/C amplifier Body ECU Rear blower motor Rear blower resistor	ACC POWER SOURCE CIRCUIT - - REAR BLOWER MOTOR CIRCUIT REAR BLOWER MOTOR CIRCUIT
Air Flow Control: No blower control	Body ECU Rear A/C blower motor Rear A/C blower resistor Rear A/C amplifier Rear solar sensor circuit	- REAR BLOWER MOTOR CIRCUIT REAR BLOWER MOTOR CIRCUIT - DTC B1428/28 SOLAR SENSOR CIRCUIT (REAR SIDE)
Air Flow control: Insufficient air flow	Rear blower motor Rear blower resistor	REAR BLOWER MOTOR CIRCUIT REAR BLOWER MOTOR CIRCUIT
Temperature control: No cool air comes out	Refrigerant volume Drive belt tension Refrigerant pressure Compressor circuit Pressure sensor circuit Exhaust damper control servomotor circuit Ambient temperature sensor circuit Rear A/C amplifier Rear solar sensor circuit	ON-VEHICLE INSPECTION ON-VEHICLE INSPECTION ON-VEHICLE INSPECTION COMPRESSOR CIRCUIT DTC B1423/23 PRESSURE SENSOR CIRCUIT EXHAUST DAMPER CONTROL SERVOMOTOR CIRCUIT DTC B1412/12 AMBIENT TEMPERATURE SENSOR CIRCUIT - DTC B1428/28 SOLAR SENSOR CIRCUIT (REAR SIDE)