## Climate Control

#### DTC Troubleshooting (cont'd)

21-124

12. Disconnect climate control unit connector A (14P).

13. Check for continuity between the No. 7 and No. 8 terminals of climate control unit connector A (14P) and body ground individually.

CLIMATE CONTROL UNIT CONNECTION A (14P)

Wire side of female terminals

Is there continuity?

YES - Repair any short to body ground in the wire(s) between the climate control unit and the power transistor.

NO - Go to step 14.

14. Check for continuity between the following terminals of climate control unit connector A (14P) and power transistor 4P connector.

    14P: | 4P:
    No. 7 | No. 1
    No. 8 | No. 3

CLIMATE CONTROL UNIT CONNECTOR A (14P)

Wire side of female terminals

POWER TRANSISTOR 4P CONNECTOR

Wire side of female terminals

Is there continuity?

YES - Go to step 15.

NO - Repair any open in the wire(s) between the climate control unit and the power transistor.

15. Reconnect climate control unit connector A (14 P).

16. Test the power transistor (see page 21-50).

Is the power transistor OK?

YES - Check for loose wires or poor connections at climate control unit connector A (14P) and at the power transistor 4P connector. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit.

NO - Replace the power transistor.

17. Disconnect the jumper wire.
18. Disconnect the blower motor 2P connector.
19. Measure the voltage between the No. 1 terminal of the blower motor 2P connector and body ground.

BLOWER MOTOR 2P CONNECTOR

Wire side of female terminals

Is there battery voltage?

YES - Replace the blower motor.

NO - Go to step 20.

20. Turn the ignition switch OFF.
21. Remove the blower motor relay from the under-hood fuse/relay box and test it (see page 22-80).

Is there relay OK?

YES - Go to step 22.

NO - Replace the blower motor relay.