( TL19E00K73700000000BBAT10 )

How to Troubleshoot the Heating

Checking for DTCs The temperature display indicates single or multiple DTCs. If no DTCs are present, the indicator remains blank. NOTE: If indicator segments A, C, D, E, K, with the AUTO indicator, or the A/C ON indicator are on at the same time, there may be an open in the common ground wire.

DTC (Driver's Temperature Indicator Segment, AUTO, and A/C Indicator) | Detection Item
--- | ---
A and AUTO | An open in the in-car temperature sensor circuit
B and AUTO | A short in the in-car temperature sensor circuit
C and AUTO | An open in the outside air temperature sensor circuit
D and AUTO | A short in the outside air temperature sensor circuit
E and AUTO | An open in the sunlight sensor circuit
F and AUTO | A short in the sunlight sensor circuit
A and A/C ON | An open in the driver's air mix control motor circuit
B and A/C ON | A short in the driver's air mix control motor circuit
C and A/C ON | A problem in the driver's air mix control linkage, door, or motor circuit
D and A/C ON | An open in the passenger's air mix control motor circuit
E and A/C ON | A short in the passenger's air mix control motor circuit
F and A/C ON | A problem in the passenger's air mix control linkage, door, or motor circuit
G and A/C ON | An open in the mode control motor circuit
H and A/C ON | A short in the mode control motor circuit
J and A/C ON | A problem in the mode control linkage, doors, or motor circuit
K and A/C ON | An open in the recirculation control motor circuit
L and A/C ON | A short in the recirculation control motor circuit
M and A/C ON | A problem in the recirculation control linkage, door, or motor circuit
N and A/C ON | A problem in the blower motor circuit
A | Heater control unit internal error
B | Output shaft (countershaft) speed sensor signal error. Check for DTCs in the A/T system and go to the indicated DTC's troubleshooting. If no DTCs are found, replace the heater control unit
C | Engine coolant temperature (ECT) sensor signal error. Check for DTCs in the PGM-FI system and go to the indicated DTC's troubleshooting. If no DTCs are found, replace the heater control unit
D | Communication bus line error (bus-off)