## Heating

#### DTC Troubleshooting (cont'd)

21-20

12. Disconnect heater control panel connector A (14P).

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

HEATER CONTROL PANEL CONNECTOR A (14P)

Wire side of female terminals

Is there continuity?

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

NO - Go to step 14.

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

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

HEATER CONTROL PANEL 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 heater control panel and the power transistor.

15. Reconnect the heater control panel connector A (14P).

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

Is the power transistor OK?

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

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 the relay OK?

YES - Go to step 22.

NO - Replace the blower motor relay.