DaimlerChrysler Jeep Grand Cherokee 2002 Service Manual page 224

DRIVEABILITY - DIESEL
*A/C OPERATES IN ALL MODE SWITCH POSITIONS —
TEST
4 Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Disconnect the A/C Clutch harness connector.
Turn the ignition on.
Measure the voltage of the A/C Clutch Relay Output circuit.
Is the voltage above 1.0 volt?
Yes → Repair the A/C Clutch Relay Output circuit for a short to voltage.
→ Go To 5
No
5 Turn the ignition off.
Install a substitute relay in place of the A/C Clutch Relay.
Turn the ignition on.
With the DRBIII , actuate the A/C Clutch Relay.
Does the A/C Clutch Relay cycle on and off?
Yes → Replace the A/C Clutch Relay.
→ Replace and program the Engine Control Module in accordance
No
6 Turn the ignition off.
Disconnect the BCM C2 harness connector.
Disconnect the AZC Module C2 harness connector or the A/C - Heater Control C1
harness connector.
Measure the resistance of the A/C Switch Signal circuit between the AZC Module C2
harness connector or the A/C - Heater Control C1 harness connector and ground.
Is the resistance below 100K ohms?
Yes → Repair the A/C Switch Signal Circuit for a short to ground.
→ Go To 7
No
7 Turn the ignition off.
Make sure that the BCM harness connectors are connected to the BCM.
Disconnect the AZC Module C2 harness connector or the A/C - Heater Control C1
harness connector.
Turn the ignition on.
With the DRBIII in BCM, select Inputs/Outputs.
Monitor the A/C Select Switch state while connecting a jumper wire between ground
and the A/C Switch Signal circuit in the AZC Module C2 harness connector or the A/C
- Heater Control C1 harness connector.
Does the A/C Select Switch state change from Off to On when the jumper wire is
connected?
Yes → Replace the AZC Module or the A/C - Heater Control Module in
→ Replace and program the Body Control Module in accordance
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform BODY VERIFICATION TEST - VER 1.
accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
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Continued
APPLICABILITY
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