AC/Air Conditioning — Blower Motor Circuit, page 60

AC–60
AIR CONDITIONING SYSTEM – TROUBLESHOOTING

Blower Motor Circuit

CIRCUIT DESCRIPTION

This is the power source for the blower motor.

WIRING DIAGRAM

Blower
Motor
2  1
B  BR
2  1
M+ B5  M- B5
Blower
Motor
Control
Relay
From
Heater → L-R  1  L-R  3  L-R  2
Relay        B4  IK1        B4
+B
1 B4  GND
W-B
1 K1
W-B

3  L  2  L  13  L  15
B4  S1     IK1  IF3     A16
                              BLW

A/C Amplifier

BLW

NO8844

INSPECTION PROCEDURE

1  Check voltage between terminal BLW of A/C amplifier connector and
body ground.

ON

Connect

V
BLW

BE3840
NO8790

P  Remove the A/C amplifier with connector still connected

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

OK  Voltage:  1 – 3 V

NG                    OK  Proceed to next circuit inspection shown on matrix
                          chart (See page AC–26).

Go to step  2 .