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 terminals RHR and RFR of luggage room J/B ECU connector and body ground.
PREPARATION:

Remove luggage room J/B ECU with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Measure voltage between terminals RHR and RFR of luggage room J/B ECU connector and body ground, when rear blower motor speed to following conditions.
OK:

Fig 1: Removing Luggage Room J/B ECU With Connectors Still Connected
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Terminal Position Specification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Go to step 4 .
2. NG : Go to next step.
Check voltage between terminals RHR and RFR1 of A/C amplifier connector and body ground.
PREPARATION:

Remove A/C amplifier with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Operate blower motor to ON.
3. Measure voltage between terminals RHR and RFR1 of A/C amplifier connector and body ground.
OK:

Fig 3: Removing A/C Amplifier With Connectors Still Connected
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Terminal Position Specification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Go to step 4 .
2. OK : Go to next step.
Check harness and connector between A/C amplifier and luggage room J/B ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Check and replace luggage room J/B ECU.
Check voltage between terminals RHI, RLO and RSLO of A/C amplifier connector and body ground.
PREPARATION:

Remove A/C amplifier with connectors still connected.

CHECK:
1. Turn ignition switch to ON.
2. Measure voltage between terminals RHI, RLO and RSLO of A/C amplifier and body ground, when rear blower motor speed to following conditions.
OK:

Fig 5: Removing A/C Amplifier With Connectors Still Connected
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 6: Terminal Position Specification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK : Go to step 7 .
2. NG : Go to next step.

Check blower resistor.

PREPARATION:

Remove blower resistor (See BLOWER RESISTOR (FOR REAR A/C) ).

CHECK:

Measure resistance between terminal as shown on the chart.

OK:

TESTER CONDITION SPECIFICATION

Tester connection	Specified condition
1 - 3	5.2 - 6.0 Ω
2 - 3	10.5 - 12.1 Ω.

Fig 7: Identifying Blower Resistor

NG : Replace blower resistor.
OK : Go to next step.

Check harness and connector between blower resistor and A/C amplifier (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair and replace harness or connector.
2. OK : Go to next step.
Check blower motor.
PREPARATION:

Remove blower motor (See REAR COOLING UNIT ).

CHECK:

Connect the positive (+) lead from the battery to terminal 1 of blower motor connector and the negative (-) lead to terminal 3.

OK:

Blower motor operates smoothly.

Fig 8: Checking Blower Motor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG : Replace blower motor.
2. OK : Go to next step.
Check harness and connector between blower motor and blower resistor, blower motor and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair and replace harness or connector.
2. OK : Check and replace A/C amplifier.