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Pinpoint Test Y: The Temperature Control Is Inoperative Using The Rear Auxiliary Climate Controls

NOTE: Carry out this test only if the front auxiliary climate control assembly temperature control operates correctly.

Y1 CHECK CIRCUIT 1130 (PK/LG) FOR AN OPEN
- Disconnect: Front Auxiliary Climate Control Assembly C989b.
- Disconnect: Rear Auxiliary Climate Control Assembly C3198b.
- Measure the resistance between front auxiliary climate control assembly C989b-8, circuit 1130 (PK/LG) and rear auxiliary climate control assembly C3198b-3, circuit 1130 (PK/LG).
  
  Fig 1: Checking Circuit 1130 (PK/LG) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to Y2.

No: REPAIR circuit 1130 (PK/LG) for an open. TEST the system for normal operation.
Y2 CHECK THE REAR AUXILIARY CLIMATE CONTROL ASSEMBLY
- Carry out the rear auxiliary climate control assembly component test.
- Does the rear auxiliary climate control assembly test good?
Yes: INSTALL a new front auxiliary climate control assembly. TEST the system for normal operation.

No: INSTALL a new rear auxiliary climate control assembly. TEST the system for normal operation.