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YES
NO YES
NO
YES
NO
DTC B1228 or DTC indicator D:
21-3421-34Climate Control
DTC Troubleshooting (cont’d)
PNK
OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR RED
CLIMATE CONTROL UNIT 32P CONNECTOR
9. Check for continuity between the climate control
unit 32P connector terminal No. 19 and the outside
air temperature sensor 2P connector terminal No. 2.
Check for loose wires or poor connections at
the climate control unit 32P connector and at the
outside air temperature sensor 2P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
Repair open in the wire between the climate
control unit and the outside air temperature
sensor. 1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Remove the outside air temperature sensor (see page 21-68), and test it (see page 21-68).
Go to step 7.
Replace the outside air temperature sensor.
7. Disconnect the climate control unit 32P connector.A Short in the
Outside Air Temperature Sensor Circuit
Wire side of female terminals
Wire side of female terminals
Is there continuity?
I s DT C B1228 or D i nd i cat ed ?
Is t he out si d e ai r t emper at ur e sensor OK ?
08/08/21 14:42:16 61SNR030_210_0035
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Page 1914 of 2893

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NO
YES
NO YES
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YES
NO
DTC B1229 or DTC indicator E:
21-3521-35
CLIMATE CONTROL UNIT 32P CONNECTOR
BLU
RED
CLIMATE CONTROL UNIT 32P CONNECTOR
BLU
SUNLIGHT SENSOR 2P CONNECTORPUR
PUR
CLIMATE CONTROL UNIT 32P CONNECTOR
8. Check for continuity between body ground and the
climate control unit 32P connector terminal No. 25.
Repair short to body ground in the wire
between the climate control unit and the outside air
temperature sensor.
Go to step 9.
9. Check for continuity between the climate control unit 32P connector terminals No. 19 and No. 25.
Repair short in the wires between the climate
control unit and the outside air temperature
sensor.
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit. 1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure, check for loose wires or
poor connections on the sunlight sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the sunlight sensor 2P connector.
7. Disconnect the climate control unit 32P connector.
8. Check for continuity between the climate control unit 32P connector terminal No. 24 and the sunlight
sensor 2P connector terminal No. 2.
Go to step 9.
Repair open in the wire between the climate
control unit and the sunlight sensor.
(cont’d)An Open in
the Sunlight Sensor Circuit
Wire side of female terminals
Wire side of female terminals
Wire side of female terminalsWire side of female terminals
Is there continuity?
Is there continuity? I s DT C B1229 or E i nd i cat ed ?
Is there continuity?
08/08/21 14:42:17 61SNR030_210_0036
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Page 1915 of 2893

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NO
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YES
NO
YES
NO
DTC B1230 or DTC indicator F:
21-3621-36Climate Control
DTC Troubleshooting (cont’d)
SUNLIGHT SENSOR 2P CONNECTOR
RED
RED
CLIMATE CONTROL UNIT 32P CONNECTOR
PUR
CLIMATE CONTROL UNIT 32P CONNECTOR
9. Check for continuity between the climate control
unit 32P connector terminal No. 19 and the sunlight
sensor 2P connector terminal No. 1.
Go to step 10.
Repair open in the wire between the climate
control unit and the sunlight sensor.
10. Reconnect the sunlight sensor 2P connector.
11. Reconnect the climate control unit 32P connector.
12. Test the sunlight sensor (see page 21-69).
Check for loose wires or poor connections at
the climate control unit 32P connector and at the
sunlight sensor 2P connector. If the connections are
good, substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
Replace the sunlight sensor (see page 21-69). 1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the sunlight sensor 2P connector.
7. Disconnect the climate control unit 32P connector.
8. Check for continuity between body ground and the climate control unit 32P connector terminal No. 24.
Repair short to body ground in the wire
between the climate control unit and the sunlight
sensor.
Go to step 9.A Short in the
Sunlight Sensor Circuit
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?I s t he sunl i ght sensor OK ? I s DT C B1230 or F i nd i cat ed ?
Is there continuity?
08/08/21 14:42:17 61SNR030_210_0037
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Page 1916 of 2893

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NO
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NO YES
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NO
DTC B1231 or DTC indicator G:
21-3721-37
RED
PUR
CLIMATE CONTROL UNIT 32P CONNECTOR
9. Check for continuity between the climate control
unit 32P connector terminals No. 19 and No. 24.
Repair short in the wires between the climate
control unit and the sunlight sensor.
Go to step 10.
10. Reconnect the sunlight sensor 2P connector.
11. Reconnect the climate control unit 32P connector.
12. Test the sunlight sensor (see page 21-69).
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
Replace the sunlight sensor (see page 21-69). 1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure, check for loose wires or
poor connections on the evaporator temperature
sensor circuit.
5. Turn the ignition switch to LOCK (0).
6. Remove the evaporator temperature sensor (see page 21-78), and test it (see page 21-70).
Go to step 7.
Replace the evaporator temperature
sensor.
(cont’d)An Open in
the Evaporator Temperature Sensor Circuit
Wire side of female terminals
Is there continuity?
I s t he sunl i ght sensor OK ? I s DT C B1231 or G i nd i cat ed ?
Is t he ev apor at or t emper at ur e sensor OK ?
08/08/21 14:42:18 61SNR030_210_0038
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21-38Climate Control
DTC Troubleshooting (cont’d)
BRN
BRN
EVAPORATOR TEMPERATURE SENSOR 2P CONNECTOR CLIMATE CONTROL UNIT 32P CONNECTOR
RED
EVAPORATOR TEMPERATURE SENSOR 2P CONNECTOR RED
CLIMATE CONTROL UNIT 32P CONNECTOR
7. Disconnect the climate control unit 32P connector.
8. Check for continuity between the climate control
unit 32P connector terminal No. 8 and the
evaporator temperature sensor 2P connector
terminal No. 2.
Go to step 9.
Repair open in the wire between the climate
control unit and the evaporator temperature
sensor. 9. Check for continuity between the climate control
unit 32P connector terminal No. 19 and the
evaporator temperature sensor 2P connector
terminal No. 1.
Check for loose wires or poor connections at
the climate control unit 32P connector and at the
evaporator temperature sensor 2P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
Repair open in the wire between the climate
control unit and the evaporator temperature
sensor.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there continuity?
08/08/21 14:42:18 61SNR030_210_0039
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Page 1918 of 2893

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DTC B1232 or DTC indicator H:
YES
NO
YES
NO YES
NO
YES
NO
21-39
BRN
CLIMATE CONTROL UNIT 32P CONNECTOR
RED BRN
CLIMATE CONTROL UNIT 32P CONNECTOR
A Short in the
Evaporator Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Remove the evaporator temperature sensor (see page 21-78), and test it (see page 21-70).
Go to step 7.
Replace the evaporator temperature
sensor.
7. Disconnect the climate control unit 32P connector. 8. Check for continuity between body ground and the
climate control unit 32P connector terminal No. 8.
Repair short to body ground in the wires
between the climate control unit and the
evaporator temperature sensor.
Go to step 9.
9. Check for continuity between the climate control unit 32P connector terminals No. 8 and No. 19.
Repair short in the wires between the climate
control unit and the evaporator temperature
sensor.
Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
Wire side of female terminals
Wire side of female terminals
I s DT C B1232 or H i nd i cat ed ?
Is t he ev apor at or t emper at ur e sensor OK ? Is there continuity?
Is there continuity?
08/08/21 14:42:19 61SNR030_210_0040
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Page 1919 of 2893

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DTC B1233 or DTC indicator J:
YES
NO
YES
NO YES
NO
21-40Climate Control
DTC Troubleshooting (cont’d)
AIR MIX CONTROL MOTOR 7P CONNECTOR
GRY
BLK
GRY
RED
BLK
RED
CLIMATE CONTROL UNIT 32P CONNECTOR
An Open in
the Air Mix Control Motor Circuit
1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure, check for loose wires or
poor connections on the air mix control motor
circuit.
5. Turn the ignition switch to LOCK (0).
6. Test the air mix control motor (see page 21-72).
Go to step 7.
Replace the air mix control motor (see page
21-72).
7. Disconnect the air mix control motor 7P connector.
8. Disconnect the climate control unit 32P connector. 9. Check for continuity between the following
terminals of the climate control unit 32P connector
and the air mix control motor 7P connector.
32P: 7P:
No. 7 No. 5
No. 19 No. 7
No. 27 No. 3
Check for loose wires or poor connections at
the climate control unit 32P connector and at the air
mix control motor 7P connector. If the connections
are good, substitute a known-good climate control
unit and recheck. If the symptom/indication goes
away, replace the original climate control unit.
Repair open in the wire(s) between the
climate control unit and the air mix control
motor.
Wire side of female terminals Wire side of female terminals
I s DT C B1233 or J i nd i cat ed ?
I s t he ai r mi x cont r ol mot or OK ? Is there continuity?
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Page 1920 of 2893

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DTC B1234 or DTC indicator K:
YES
NO
YES
NO YES
NO
YES
NO
21-41
RED
CLIMATE CONTROL UNIT 32P CONNECTOR
BLK
GRY
A Short in the
Air Mix Control Motor Circuit
1. Clear the DTC with the HDS.
2. Turn the ignition switch to LOCK (0), and then turn
to ON (II).
3. Do the self-diagnostic with the HDS (see page 21-10) or climate control unit (see page 21-11).
4. Check for DTCs.
Go to step 5.
Intermittent failure.
5. Turn the ignition switch to LOCK (0).
6. Test the air mix control motor (see page 21-72).
Go to step 7.
Replace the air mix control motor (see page
21-72).
7. Disconnect the air mix control motor 7P connector.
8. Disconnect the climate control unit 32P connector. 9. Check for continuity between body ground and the
climate control unit 32P connector terminals No. 7,
19, and No. 27 individually.
Repair short to body ground in the wire(s)
between the climate control unit and the air mix
control motor.
Go to step 10.
10. Check for continuity between the climate control unit 32P connector terminals as follows.
From terminal To terminals 7 19, 27
19 27
Repair the short in the wires.
Go to step 11.
(cont’d)
Wire side of female terminals
I s DT C B1234 or K i nd i cat ed ?I s t he ai r mi x cont r ol mot or OK ? Is there continuity?
I s t her e cont i nui t y bet w een any of t he t er mi nal s?
08/08/21 14:42:19 61SNR030_210_0042
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