AC–53 AIR CONDITIONING SYSTEM – TROUBLESHOOTING INSPECTION PROCEDURE 1 Check voltage between terminal +B of A/C amplifier connector and body ground. LOCK Connect P Remove the A/C amplifier with connector still connected. C Measure voltage between terminal + B of air conditioner control assembly connector and body ground. OK Voltage: Battery positive voltage +B SE3842 N08810 NG OK Proceed to next circuit inspection shown on matrix chart (See page AC–26). 2 Check ECU–B fuse. ECU-B Fuse P Remove ECU–B fuse from J/B No. 1. C Check continuity of ECU–B fuse. OK Continuity J/B No. 1 N08783 OK NG Check for short in all the harness and components to the ECU–B fuse (See attached wiring diagram). Check and repair harness and connector between A/C amplifier and battery.