#
NO.24 A/C ALWAYS ON/A/C COMPRESSOR RUNS CONTINUOUSLY [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010300000W15

24 | A/C always ON or A/C compressor runs continuously
DESCRIPTION | • A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE | • Stuck engagement • A/C relay is stuck closed. • Short to GND between A/C switch and PCM • Short to GND circuit between A/C relay and PCM • A/C relay to magnetic clutch circuit shorts to battery power.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Connect WDS or equivalent to DLC-2. • Turn ignition switch to ON (Engine OFF). • Retrieve any DTC. • Is "PASSED" displayed? | Yes | No DTC is displayed: • Go to next step.
No | DTC is displayed: • Go to appropriate DTC test.
2 | • Start engine and run it at idle. • Turn A/C switch on. • Remove A/C relay. • Does A/C magnetic clutch disengage? | Yes | Inspect for following: • A/C relay is stuck closed. • Short to GND circuit between A/C relay and PCM terminal 47

  - If both items are normal, go to next step.

No | Inspect if circuit between A/C relay and magnetic clutch shorts to battery power circuit. • If circuit is normal, inspect magnetic clutch stuck engagement or clearance.
3 | • Disconnect refrigerant pressure switch connector. • Start the engine and turn A/C switch on.

  Note

  • A/C should not work when the connector disconnected. If A/C remains working, short to GND circuit may be present.

• Does A/C remain working?
Yes
Inspect for short to GND circuit between refrigerant pressure switch and PCM terminal 5.
No | Go to next step.
4 | • Reconnect refrigerant pressure switch connector. • Turn off A/C switch.

  Note

  • A/C should not work when the A/C switch is turned off. If A/C remains working, short to GND circuit may be present.

• Does A/C remain working?
Yes
Inspect for following:
• Short to GND circuit between A/C switch and A/C amplifier
• Short to GND circuit between A/C amplifier and refrigerant pressure switch
No | Inspect for stuck closed A/C switch.
5 | • Verify test results.

  - If normal, return to diagnostic index to service any additional symptoms.
  - If malfunction remains, inspect related Service Information and perform repair or diagnosis.

  • If vehicle is repaired, troubleshooting completed.
  • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.