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

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

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

X1 CHECK CIRCUIT 1127 (YE) FOR AN OPEN
- Disconnect: Front Auxiliary Climate Control Assembly C938a.
- Disconnect: Rear Auxiliary Climate Control Assembly C940a.
- Measure the resistance between the front auxiliary climate control assembly C938a-8, circuit 1127 (YE) and the rear auxiliary climate control assembly C940a-3, circuit 1127 (YE).
  
  Fig 1: Checking Circuit 1127 (YE) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to X2.
- No : REPAIR circuit 1127 (YE). TEST the system for normal operation.
X2 CHECK THE REAR AUXILIARY CLIMATE CONTROL ASSEMBLY
- Carry out the rear auxiliary climate control assembly component test in this article.
- Does the rear auxiliary climate control assembly test good?
- Yes : INSTALL a new front auxiliary climate control assembly. REFER to AUXILIARY CLIMATE CONTROL . TEST the system for normal operation.
- No : INSTALL a new rear auxiliary climate control assembly. REFER to AUXILIARY CLIMATE CONTROL . TEST the system for normal operation.