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 .