Inspection Procedure

PREPARATION: 

Remove the A/C amplifier with connector still connected.

CHECK: 

1. Turn ignition switch to ON.
2. Operate blower motor.
3. Measure voltage between terminal BLW of A/C amplifier and body ground.

   OK: 

   Voltage: 1 - 3 V 

   Fig 1: Checking Voltage Between Terminal BLW Of A/C Amplifier Connector And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Proceed to next circuit inspection shown on problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
2. NG: Go to next step. 

PREPARATION: 

Remove blower motor.

CHECK: 

Connect the positive (+) lead from the battery to terminal 1 of blower motor connector and the negative (-) lead to terminal 2.

OK: 

Blower motor operates smoothly. 

Fig 2: Checking Blower Motor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Replace blower motor. 
2. OK: Go to next step. 

PREPARATION: 

Remove blower motor control relay with connectors still connected.

CHECK: 

1. Turn ignition switch ON.
2. Operate blower motor (High blower speed).

   OK: 

   BLOWER MOTOR VOLTAGE AND CONTINUITY SPECIFICATION
   
   

   Terminals	Standard Value
   GND <=> Body Ground	Continuity
   +B <=> Body Ground	Battery positive voltage
   +M <=> Body Ground	Battery positive voltage
   M+ <=> M-	Battery positive voltage
   Sl <=> Body Ground	1 - 3 V

   Fig 3: Identifying Blower Motor Control Relay Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG: Replace blower motor relay. 
   2. OK: Repair or replace harness or connector.