DTC Troubleshooting: L

DTC indicator L:  An Open or Short in the Mode Control Motor Circuit

1.Clear the DTC by turning the ignition switch OFF, and then ON (II).

2.Operate the climate control system in several modes.

3.Check for DTCs using the self-diagnostic.

Is DTC L indicated?


YES - Go to 4.


NO - Intermittent failure, check for loose wires or poor connections on the mode control motor circuit.n


4.Turn the ignition switch OFF.

5.Test the mode control motor.

Is the mode control motor OK?


YES - Go to 6.


NO - Replace the mode control motor.n


6.Disconnect the mode control motor 7P connector.

7.Disconnect climate control unit 28P connector.

8.Check for continuity between following terminals of climate control unit 28P connector and the mode control motor 7P connector.

28P: 7P: 
No. 7 No. 1 

No. 8 No. 2 
No. 16 No. 6 
No. 17 No. 5 
No. 18 No. 7 
No. 19 No. 4 
No. 20 No. 3 

 

Is there continuity?


YES - Go to 9.


NO - Repair any open in the wire(s) between the climate control unit and the mode control motor.n

9.Check for continuity between body ground and climate control unit 28P connector terminals No. 7, 8, 16, 17, 18, 19 and 20 individually.

 

Is there continuity?


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


NO - Go to 10.


10.Check for continuity between the terminals of climate control unit 28P connector as follows.

Terminal To terminals 
8, 16, 17, 18, 19, 20 
16, 17, 18, 19, 20 
16 17, 18, 19, 20 
17 18, 19, 20 
18 19, 20 
19 20 

Is there continuity between any of the terminals?


YES - Repair the short in the wires.n


NO - Go to 11.

11.Turn the ignition switch ON (II), and check the same terminals for voltage.

 

Is there any voltage?


YES - Repair any short to power in the wire(s) between the climate control unit and the mode control motor. This short may also damage the climate control unit. Repair the short to power before replacing the  climate control unit.n


NO - Check for loose wire or poor connections at climate control unit 28P connector and at the mode control motor 7P 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.n