B1235

Factory Manual References

Factory service manual diagnostic procedure for 2012 acura zdx

Climate Control System DTCS

CLIMATE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Description
U1280 Communication bus line error (BUS-OFF)
U0155 Lost communication with gauge control module (climate control unit)
B1215 An open or short in the recirculation control motor circuit
B1225 An open in the in-car temperature sensor circuit
B1226 A short in the in-car temperature sensor circuit
B1227 An open in the outside air temperature sensor circuit
B1228 A short in the outside air temperature sensor circuit
B1229 An open in the sunlight sensor circuit
B1230 A short in the sunlight sensor circuit
B1231 An open in the evaporator temperature sensor circuit
B1232 A short in the evaporator temperature sensor circuit
B1233 An open in the air mix control motor circuit (driver's)
B1234 A short in the air mix control motor circuit (driver's)
B1235 A problem in the air mix control motor circuit, linkage, door, or motor (driver's)
B1236 An open in the passenger's air mix control motor circuit
B1237 A short in the passenger's air mix control motor circuit
B1238 A problem in the passenger's air mix control motor circuit, linkage, door, or motor
B1239 An open or short in the mode control motor circuit (driver's)
B1240 A problem in the mode control motor circuit, linkage, door, or motor (driver's)
B1241 A problem in the blower motor circuit
B1242 An open or short in the passenger's mode control motor circuit
B1243 A problem in the passenger's mode control motor circuit, linkage, door, or motor
B2967 An open in the humidity sensor circuit
B2968 A short in the humidity sensor circuit
B2969 Climate control unit lost communication with MICU (WIPSW message) (driver's)
B2979 An open in the A/C pressure sensor circuit
B2980 A short in the A/C pressure sensor circuit
B2983 A problem in the recirculation control motor circuit, linkage, door, or motor

A L L Diagnostic Trouble Codes ( DTC )

B1235




DTC Troubleshooting: B1235 (L and AUTO)

DTC B1235 or DTC indicator L and AUTO:

A Problem in the Air Mix Control Motor Circuit, Linkage, Door, or Motor (Driver's)

1. Clear the DTC with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II), or press the engine start/stop button to select the OFF mode, and then the ON mode.

3. Do the Self-Diagnostic Function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1235 or L and AUTO indicated?

YES -

Go to step 5.

NO -

Intermittent failure. Check for loose wires or poor connections on the driver's air mix control motor circuit.

5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

6. Test the driver's air mix control motor Driver's Air Mix Control Motor Test.

Is the driver's air mix control motor OK?

YES -

Go to step 7.

NO -

Replace the driver's air mix control motor Driver's Air Mix Control Motor Replacement, or repair the driver's air mix control linkage or door.

7. Disconnect the driver's air mix control motor 7P connector.

8. Disconnect climate control unit connector A (32P).

9. Check for continuity between the following terminals of climate control unit connector A (32P) and the driver's air mix control motor 7P connector.

Factory service manual diagram




Factory service manual diagram




Is there continuity?

YES -

Go to step 10.

NO -

Repair an open in the wire(s) between the climate control unit and the driver's air mix control motor.

10. Check for continuity between body ground and climate control unit connector A (32P) terminals No. 11 and No. 12 individually.

Factory service manual diagram




Is there continuity?

YES -

Repair a short to body ground in the wire(s) between the climate control unit and the driver's air mix control motor.

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit Service and Repair.

Supporting Diagrams & Locations

Reference material from the factory manual for this diagnostic procedure.

Diagram

A/C Leak Detection (B07-025)

Location

Accessory Power Sockets

Location

Active Damper System

Location

ACURALINK

Location

Adaptive Cruise Control (Acc)

Fuse/Relay

B18-020: Warranty Extension: Customer Support Program For Driver's Airbag Inflator For 2013-14 ILX Hybrid And Other Listed Years And Models (Expires February 28, 2026) (B18-020)

Fuse/Relay

2012 ZDX: TQI And New Model Service Information (11-019)

Fuse/Relay

2012 ZDX: TQI And New Model Service Information (11-019)

Fuse/Relay

2012 ZDX: TQI And New Model Service Information (11-019)

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