Main Power Supply and Ground Circuit Check

POWER SUPPLY CIRCUIT CHECK FOR AUTO A/C SYSTEM
Check power supply circuit for auto air conditioning system.

AUTO AMP. CHECK







Check power supply circuit for auto amp. with ignition switch ON. Measure voltage across terminal No. (1), (2), (11) and body ground.







Check body ground circuit for auto amp. with ignition switch OFF. Check for continuity between terminal No. (5), (42) and body ground.

CONTROL UNIT CHECK







Check power supply circuit for control unit with ignition switch ON.
Measure voltage across terminal No. (3) and body ground.







Check body ground circuit for control unit with ignition switch OFF.
Check for continuity between terminal No. (8) and body ground.