Control Assembly: Testing and Inspection

A/C Amplifier Inspection
1. Disassemble the heater control assembly.
2. Connect the A/C amplifier connectors (26-pin, 22-pin, 20-pin) and information display connector.
3. Start the engine.




4. Measure the voltage at the terminals of the A/C amplifier connector and refer to the terminal voltage chart.

























5. If not as specified, inspect the appropriate area.
6. If the appropriate area is correct, replace the A/C amplifier.

Heater Control Unit Inspection




1. Check for continuity between switch terminals.




2. Verify that there is continuity between terminals J and L of the heater control unit connector.




3. Apply battery positive voltage to terminal N and ground to terminals E, G, I, K, M and verify that the following indicators turn on.




4. If not as specified, replace the heater control unit.