Climate Control Unit Power and Ground Circuit Troubleshooting

NOTE:  Do this troubleshooting procedure only if sent here by symptom troubleshooting index - Refer to: Heating and A/C Systems Symptom Troubleshooting Index(Heating/Air Conditioning) Climate Control System Symptom Troubleshooting Index(Climate Control)  .

• 1. Fuse check:

  - 1. Check the following fuse.

  Fuse	No. B22 (7.5 A)
  Location	Under-dash fuse/relay box

  Is the fuse OK?

  YES 

  Go to step 2.

  NO 

  Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. B22 (7.5 A) fuse circuit.

• 2. Open wire check (IG2 A/C line):

  - 1. Disconnect the following connector.

  Climate control unit 32P connector

  - 2. Turn the vehicle to the ON mode.

  - 3. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	Climate control unit 32P connector: disconnected
  Test point 1	Climate control unit 32P connector No. 12
  Test point 2	Body ground

  Is there battery voltage?

  YES 

  The IG2 A/C wire is OK. Go to step 3.

  NO 

  Repair an open in the wire between the No. B22 (7.5 A) fuse in the under-dash fuse/relay box and the climate control unit.

• 3. Open wire check (GND line) 1:

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Climate control unit 32P connector: disconnected
  Test point 1	Climate control unit 32P connector No. 1
  Test point 2	Body ground

  Is there continuity?

  YES 

  Go to step 4.

  NO 

  Check for an open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G502.

• 4. Open wire check (GND line) 2:

  - 1. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Climate control unit 32P connector: disconnected
  Test point 1	Climate control unit 32P connector No. 25
  Test point 2	Body ground

  Is there continuity?

  YES 

  The GND wires are OK. Replace the climate control unit .

  NO 

  Check for an open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G502.