Checking the Power Supply and Ground

Checking The Power Supply And Ground For The Control Module









Check climate control module terminal # A1 and relay 2/29 (passenger compartment relay box) connectors. Check for contact resistance and oxidation.

Check fuse 23 and 24 in the passenger compartment fusebox for the climate control module.

NOTE: If the fuse is blown, check the circuit after the fuse for a short-circuit to ground before replacing the fuse. Then replace the fuse.

For further information about the circuit after the fuse, refer to the wiring diagram. See Diagrams/Electrical.

Check the cable for power supply between fuse 23 in the passenger compartment fusebox and control module terminal # A 8. Check for an open-circuit.

Check the function of relay 2/29 by replacing it with a new relay.

Check the cable for power supply (delayed X supply) between fuse 24 and relay 2/29 terminal # 3. Check for an open-circuit. The voltage at the relay terminal must be battery voltage, measured to ground.

Check the cable for power supply (delayed X supply) between relay 2/29 terminal # 1 and climate control module (CCM) terminal # A1. Check for an open-circuit. The voltage at the terminal must be battery voltage, measured to ground.

Check power supply cable between fuse 23 and the climate control module (CCM) terminal # A8. Check for an open-circuit.

Check the ground lead between climate control module (CCM) terminal # A16 and ground terminal 31/84. Check for an open-circuit. Check ground terminal 31/84. Check for contact resistance and oxidation.

Remedy as necessary.

Other information:
- To access or replace the control module, see Climate Control Module (CCM), Replacing.
- To connect the breakout box, see Connecting the breakout box. Connecting the Breakout Box, Climate Control Module (CCM)
- For other values, see Signal description, Climate Control Module (CCM), Connector A.
- Checking wiring and terminals.

Was a fault detected?

Yes/No Component Tests and General Diagnostics