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Honda Ridgeline. Manual - part 396

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−

DTC B1202:

DTC B1205:

DTC B1206:

DTC B1207:

YES

21-20

Heating/Air Conditioning

DTC Troubleshooting

HVAC Control Unit Internal Error

HVAC Control Unit Lost

Communication with Gauge Control Module
(VSP/NE message)

HVAC Control Unit Lost

Communication with Gauge Control Module
(ECT message)

HVAC Control Unit Lost

Communication with Gauge Control Module
(ILLUMI message)

NOTE:

• Check the battery condition (see page 22-74) and the

charging system (see page 4-26).

• If you are troubleshooting multiple DTCs, be sure to

follow the instructions in B-CAN system diagnosis
test mode A (see page 22-99).

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS.

The HVAC control unit is faulty, replace the

control unit.

Intermittent failure, the HVAC control unit is

OK at this time.

NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN system
diagnosis test mode A (see page 22-99).

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS.

Go to step 4.

Intermittent failure, the gauge control module

and HVAC control unit are OK at this time.

4. Check for DTCs using the HDS.

Perform the gauge control module input test

(see page 22-122).

Go to step 5.

5. Turn the ignition switch OFF.

6. Disconnect the HVAC control unit 30P connector.

7. Remove the gauge control module (see page

22-263).

Is DT C B1202 indicated?

Is DT C B1205, B1206 and/ or B1207 indicated?

Is DT C B1060 or B2157 indicated?

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−

YES

DTC B1227 or DTC indicator 9:

21-21

HVAC CONTROL UNIT 30P CONNECTOR

GAUGE CONTROL MODULE CONNECTOR B (14P)

BRN/YEL

LT BLU

HVAC CONTROL UNIT 30P CONNECTOR

OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR

PNK

8. Check for continuity between the HVAC control unit

30P connector No. 11 terminal and gauge control
module connector B (14P) No. 6 terminal.

Substitute a known-good HVAC control unit,

then return to step 3 and recheck . If the problem is
still present, replace the gauge control module
(see page 22-263).

Repair open in the wire between the HVAC

control unit and gauge control module.

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS or self-diagnostic.

Go to step 4.

Intermittent failure, check for loose wires or

poor connections on the outside air temperature
sensor circuit.

4. Turn the ignition switch OFF.

5. Remove the outside air temperature sensor

(see page 21-52) and test it (see page 21-52).

Go to step 6.

Replace the outside air temperature sensor.

6. Disconnect the HVAC control unit 30P connector.

7. Check for continuity between the HVAC control unit

30P connector No. 8 terminal and the outside air
temperature sensor 2P connector No. 2 terminal.

Go to step 8.

Repair open in the wire between the HVAC

control unit and the outside air temperature
sensor.

(cont’d)

An Open in

the Outside Air Temperature Sensor Circuit

Wire side of female terminals

Is ther e continuity?

Is DT C B1227 or 9 indicated?

Is the outside air temper atur e sensor OK ?

Is ther e continuity?

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−

YES

DTC B1228 or DTC indicator 10:

21-22

Heating/Air Conditioning

DTC Troubleshooting (cont’d)

HVAC CONTROL UNIT 30P CONNECTOR

OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR

RED/BLK

8. Check for continuity between the HVAC control unit

30P connector No. 20 terminal and the outside air
temperature sensor 2P connector No. 1 terminal.

Check for loose wires or poor connections at

the HVAC control unit 30P connector and at the
outside air temperature sensor 2P connector. If the
connections are good, substitute a known-good
HVAC control unit, and recheck. If the symptom/
indication goes away, replace the original HVAC
control unit.

Repair open in the wire between the HVAC

control unit and the outside air temperature
sensor.

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS or self-diagnostic.

Go to step 4.

Intermittent failure.

4. Turn the ignition switch OFF.

5. Remove the outside air temperature sensor

(see page 21-52) and test it (see page 21-52).

Go to step 6.

Replace the outside air temperature sensor.

6. Disconnect the HVAC control unit 30P connector.

A Short in the

Outside Air Temperature Sensor Circuit

Wire side of female terminals

Is ther e continuity?

Is DT C B1228 or 10 indicated?

Is the outside air temper atur e sensor OK ?

０１

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−

YES

DTC B1231 or DTC indicator 7:

21-23

HVAC CONTROL UNIT 30P CONNECTOR

PNK

RED/BLK

HVAC CONTROL UNIT 30P CONNECTOR

PNK

RED/BLK

7. Check for continuity between body ground and the

HVAC control unit 30P connector No. 8 and No. 20
terminals.

Repair short to body ground in the wires

between the HVAC control unit and the outside air
temperature sensor.

Go to step 8.

8. Check for continuity between the HVAC control unit

30P connector No. 8 and No. 20 terminals.

Repair short in the wires between the HVAC

control unit and the outside air temperature
sensor.

Substitute a known-good HVAC control unit,

and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.

1. Clear the DTC with the HDS.

2. Operate the heater-A/C control system in several

modes.

3. Check for DTCs using the HDS or self-diagnostic.

Go to step 4.

Intermittent failure, check for loose wires or

poor connections on the evaporator temperature
sensor circuit.

4. Turn the ignition switch OFF.

5. Remove the evaporator temperature sensor

(see page 21-53) and test it (see page 21-53).

Go to step 6.

Replace the evaporator temperature

sensor.

6. Disconnect the HVAC control unit 30P connector.

(cont’d)

An Open in

the Evaporator Temperature Sensor Circuit

Wire side of female terminals

Is ther e continuity?

Is DT C B1231 or 7 indicated?

Is the evapor ator temper atur e sensor OK ?

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