Honda Ridgeline. Manual — part 398
*03
SJC8AH6K733000Y1235FAAT00
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
DTC B1235 or DTC indicator 3:
21-28
21-28
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
HVAC CONTROL UNIT 30P CONNECTOR
GRY
PNK/BLK
10. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
Repair short to power in the wire(s) between
the HVAC control unit and the air mix control motor.
This short may also damage the HVAC control unit.
Repair the short to power before replacing the
HVAC control unit.
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 air mix control motor
circuit.
4. Turn the ignition switch OFF.
5. Test the air mix control motor (see page 21-55).
Go to step 6.
Replace the air mix control motor (see page
21-55), or repair the air mix control linkage or
door.
6. Disconnect the air mix control motor 7P connector.
7. Disconnect HVAC control unit 30P connector.
A Problem in
the Air Mix Control Linkage, Door, or Motor
Wire side of female terminals
Is ther e voltage?
Is DT C B1235 or 3 indicated?
Is the air mix contr ol motor OK ?
*01
*02
−
−
−
−
YES
NO
YES
NO
21-29
AIR MIX CONTROL MOTOR 7P CONNECTOR
HVAC CONTROL UNIT 30P CONNECTOR
PNK/BLU
GRN
PNK/BLU
GRN
HVAC CONTROL UNIT 30P CONNECTOR
PNK/BLU
GRN
8. Check for continuity between the following
terminals of HVAC control unit 30P connector and
the air mix control motor 7P connector.
30P:
7P:
No. 18
No. 1
No. 19
No. 2
Go to step 9.
Repair open in the wire(s) between the HVAC
control unit and the air mix control motor.
9. Check for continuity between body ground and
HVAC control unit 30P connector No. 18 and No. 19
terminals individually.
Repair short to body ground in the wire(s)
between the HVAC control unit and the air mix
control motor.
Substitute a known-good HVAC control unit,
and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e continuity?
*01
SJC8AH6K733000Y1239FAAT00
−
−
−
−
−
−
DTC B1239 or DTC indicator 4:
YES
NO
YES
NO
YES
NO
21-30
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
HVAC CONTROL UNIT 30P CONNECTOR
RED/BLK
YEL/GRN
WHT/BLU
RED/BLU
RED/
YEL
RED/BLU
RED/YEL
RED/
BLK
WHT/BLU
YEL/
GRN
MODE CONTROL MOTOR 7P CONNECTOR
An Open or
Short in the Mode Control Motor Circuit
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 mode control motor
circuit.
4. Turn the ignition switch OFF.
5. Test the mode control motor (see page 21-56).
Go to step 6.
Replace the mode control motor (see page
21-56).
6. Disconnect the mode control motor 7P connector.
7. Disconnect the HVAC control unit 30P connector.
8. Check for continuity between the following
terminals of the HVAC control unit 30P connector
and the mode control motor 7P connector.
30P:
7P:
No. 20
No. 7
No. 27
No. 3
No. 28
No. 4
No. 29
No. 5
No. 30
No. 6
Go to step 9.
Repair open in the wires between the HVAC
control unit and the mode control motor.
Wire side of female terminals
Wire side of female terminals
Is DT C B1239 or 4 indicated?
Is the mode contr ol motor OK ?
Is ther e continuity?
*02
*03
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
21-31
HVAC CONTROL UNIT 30P CONNECTOR
YEL/GRN
RED/BLK
WHT/BLU
RED/BLU
RED/
YEL
HVAC CONTROL UNIT 30P CONNECTOR
YEL/GRN
RED/BLK
WHT/BLU
RED/BLU
RED/
YEL
9. Check for continuity between body ground and the
HVAC control unit 30P connector No. 20, 27, 28, 29,
and 30 terminals individually.
Repair short to body ground in the wires
between the HVAC control unit and the mode
control motor.
Go to step 10.
10. Check for continuity between the HVAC control unit
connector terminals as follows.
From terminal
To terminals
20
27, 28, 29, 30
27
28, 29, 30
28
29, 30
29
30
Repair the short in the wires.
Go to step 11.
11. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
Repair short to power in the wires between
the HVAC control unit and the mode control motor.
This short may also damage the HVAC control unit.
Repair the short to power before replacing the
HVAC control unit.
Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the
mode control motor 7P 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.
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e continuity between any of the ter minals?
Is ther e any voltage?
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