Honda Ridgeline. Manual — part 396
SJC8AH6K733000Y1202FAAT00
SJC8AH6K733000Y1205FAAT02
−
−
−
−
−
−
DTC B1202:
DTC B1205:
DTC B1206:
DTC B1207:
YES
NO
YES
NO
YES
NO
21-20
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?
01
01
SJC8AH6K733000Y1227FAAT00
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
DTC B1227 or DTC indicator 9:
21-21
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
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
Wire side of female terminals
Wire side of female terminals
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?
02
SJC8AH6K733000Y1228FAAT00
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
DTC B1228 or DTC indicator 10:
21-22
21-22
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
HVAC CONTROL UNIT 30P CONNECTOR
OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR
RED/BLK
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
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
02
SJC8AH6K733000Y1231FAAT00
−
−
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
YES
NO
DTC B1231 or DTC indicator 7:
21-23
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
Wire side of female terminals
Is ther e continuity?
Is ther e continuity?
Is DT C B1231 or 7 indicated?
Is the evapor ator temper atur e sensor OK ?
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