A/C Control Assembly Power & Ground Circuits
- Remove A/C control assembly. See A/C CONTROL ASSEMBLY under REMOVAL & INSTALLATION. Using DVOM connected to appropriate A/C control assembly harness connector terminals, check power and ground circuits as specified. See A/C CONTROL ASSEMBLY HARNESS CONNECTOR SPECIFICATIONS table. See Fig 1. If readings are as specified, go to next step. If readings are not as specified, repair affected circuit as necessary and retest system.
- Substitute known-good A/C control assembly and retest system. If problem is fixed, replace original A/C control assembly. If problem is still present, reinstall original A/C control assembly and go to TESTING A/C CONTROL ASSEMBLY INPUTS .
A/C CONTROL ASSEMBLY HARNESS CONNECTOR SPECIFICATIONS
| Test Between Terminals No. | Condition | Result |
|---|---|---|
| A1-Ground | Under All Conditions | Continuity |
| A4-Ground | Ignition On | B+ Voltage |
| Ignition Off | Zero Volts | |
| A5-Ground | Under All Conditions | B+ Voltage |
| A13-Ground | Ignition Switch Turned To ACC | B+ Voltage |
| Ignition Off | Zero Volts | |
| B11-Ground | Under All Conditions | Continuity |
| B10-B20 | Evaporator Temperature At 77°F (25°C) | 1.5 K/Ohms |