DTC Troubleshooting: 6

DTC 6: A Problem in the Blower Motor Circuit

1. Check the No. 21 (40 A) fuse in the under-hood fuse/relay box, and the No. 30 (7.5 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?

YES | - | Go to Step 2 .
NO | - | Replace the fuse(s), and recheck.■

1. Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire.

1. Turn the ignition switch ON (II).

Does the blower motor run?

YES | - | Go to Step 4 .
NO | - | Go to Step 17 .

1. Turn the ignition switch OFF.

1. Disconnect the jumper wire.

1. Disconnect the power transistor 4P connector.

1. Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground.

Is there continuity?

YES | - | Go to Step 8 .
NO | - | Check for an open in the wire between the power transistor and body ground. If the wire is OK, check for poor ground at G503.■

1. Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire.

1. Turn the ignition switch ON (II).

Does the blower motor run at high speed?

YES | - | Go to Step 10 .
NO | - | Repair open in the wire between the power transistor and the blower motor.■

1. Turn the ignition switch OFF.

1. Disconnect the jumper wire.

1. Disconnect the audio-HVAC module 22P connector.

1. Check for continuity between the No. 15 and No. 16 terminals of the audio-HVAC module 22P connector and body ground individually.

Is there continuity?

YES | - | Repair any short to body ground in the wire(s) between the audio-HVAC module and the power transistor.■
NO | - | Go to Step 14 .

1. Check for continuity between the following terminals of the audio-HVAC module 22P connector and the power transistor 4P connector.

   22P: | 4P:
   No. 15 | No. 3
   No. 16 | No. 1

Is there continuity?

YES | - | Go to Step 15 .
NO | - | Repair any open in the wire(s) between the audio-HVAC module and the power transistor.■

1. Reconnect the audio-HVAC module 22P connector.

1. Test the power transistor.

Is the power transistor OK?

YES | - | Check for loose wires or poor connections at the audio-HVAC module 22P connector and at the power transistor 4P connector. If the connections are good, substitute a known-good audio-HVAC module, and recheck. If the symptom/indication goes away, replace the original printed circuit board.■
NO | - | Replace the power transistor.■

1. Disconnect the jumper wire.

1. Disconnect the blower motor 2P connector.

1. Measure the voltage between the No. 1 terminal of the blower motor 2P connector and body ground.

Is there battery voltage?

YES | - | Replace the blower motor.■
NO | - | Go to Step 20 .

1. Turn the ignition switch OFF.

1. Remove the blower motor relay from the under-hood fuse/relay box, and test it.

Is the relay OK?

YES | - | Go to Step 22 .
NO | - | Replace the blower motor relay .■

1. Measure the voltage between the No. 2 terminal of the blower motor relay 4P socket and body ground.

Is there battery voltage?

YES | - | Go to Step 23 .
NO | - | Replace the under-hood fuse/relay box.■

1. Turn the ignition switch ON (II).

1. Measure the voltage between the No. 4 terminal of the blower motor relay 4P socket and body ground.

Is there battery voltage?

YES | - | Go to Step 25 .
NO | - | Repair open in the wire between the No. 30 fuse in the under-dash fuse/relay box and the blower motor relay.■

1. Turn the ignition switch OFF.

1. Check for continuity between the No. 3 terminal of the blower motor relay 4P socket and body ground.

Is there continuity?

YES | - | Repair open in the WHT/BLU wire between the blower motor relay and the blower motor.■
NO | - | Check for an open in the wire between the blower motor relay and body ground. If the wire is OK, check for poor ground at G302.■