DTC 12: A Problem in the Blower Motor Circuit
- Check the No. 12 (40A) fuse in the under-hood fuse/relay box and the No. 14 (10A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 2.
NO - Replace the fuse(s) and recheck. 
- Connect the No. 2 terminal of the blower motor 2P connector to body ground with a jumper wire.
BLOWER MOTOR 2P CONNECTOR
Wire side of female terminals
- Turn the ignition switch ON (II).
Does the blower motor run?
YES - Go to step 4.
NO - Go to step 17.
- Turn the ignition switch OFF.
- Disconnect the jumper wire.
- Disconnect the power transistor 4P connector.
- Check for continuity between the No. 2 terminal of the power transistor 4P connector and body ground.
POWER TRANSISTOR 4P CONNECTOR
Wire side of female terminals
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 G502.
- Connect the No. 2 and No. 4 terminals of the power transistor 4P connector with a jumper wire.
POWER TRANSISTOR 4P CONNECTOR
Wire side of female terminals
- 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.
- Turn the ignition switch OFF.
- Disconnect the jumper wire.
