Test E: The Air Conditioning (A/C) Is Always On
PINPOINT TEST E: THE AIR CONDITIONING (A/C) IS ALWAYS ONE1-E3:
E3-E5:
E5-E7:
E8-E9:
Normal Operation
Under normal operation, voltage is supplied to the function selector switch through circuit 29-FA13 (OG). When A/C is requested, voltage is sent to the dual-function pressure switch through circuit 15S-FA38 (GN/RD). Voltage is sent to the A/C cycling switch from the dual-function pressure switch through circuit 15S-FA17 (GN/OG). Voltage is sent to the powertrain control module (PCM) from the A/C cycling switch through circuit 15S-RE8 (GN/YE). When the PCM commands the A/C relay ON, the PCM provides ground to the relay coil through 31S-FA11 (BK/YE). Voltage is supplied to the relay through circuit 15-FA11 (GN/YE). Voltage is supplied to the relay switch through circuit 30-FA12 (RD/BU). When the relay is energized, voltage is sent to the A/C clutch coil through circuit 15S-FA6 (GN/YE). The A/C clutch coil is grounded through circuit 31-FA6 (BK).
The function selector switch is grounded through circuit 91-FA20 (BK/YE). When the switch is closed, ground is provided to the function selector switch through circuit 91S-FA20 (BK/YE).
Possible Causes
- An open in circuit 31S-FA11 (BK/YE)
- A short to ground in circuit 31S-FA11 (BK/YE)
- A short to voltage in circuit 15S-FA38 (GN/RD), 15S-FA17 (GN/OG), 15S-RE8 (GN/YE), 91S-FA20 (BK/YE) or 15S-FA6 (GN/YE)
- Function selector switch
- Powertrain control module (PCM)
- A/C clutch air gap