DTC B11F5:86, B1A69:86, U210A:86 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2900700

System malfunction location

•  B11F5:86: Invalid data (humidity sensor temperature) received from humidity sensor

•  B1A69:86: Invalid data (relative humidity) received from humidity sensor

•  U210A:86: Invalid data (windshield temperature) received from humidity sensor

Detection condition

•  Climate control unit receives the invalid data from the front body control module (FBCM).

Fail-safe function

B11F5:86

•  Humidity sensor input value (temperature) is fixed at -40 °C {-40 °F}.

B1A69:86

•  Humidity sensor input value (humidity) is fixed at 100 %.

U210A:86

•  Humidity sensor input value (windshield temperature) is fixed at -40 °C {-40 °F}.

Possible cause

•  Malfunction in the wiring harness between the humidity sensor and front body control module (FBCM)

•  Malfunction in the wiring harness between the front body control module (FBCM) and instrument cluster

•  Malfunction in the wiring harness between the instrument cluster and climate control unit

•  Humidity sensor malfunction

•  Instrument cluster malfunction

•  Front body control module malfunction

•  Climate control unit malfunction

System wiring diagram

Not applicable

System malfunction location	• B11F5:86: Invalid data (humidity sensor temperature) received from humidity sensor • B1A69:86: Invalid data (relative humidity) received from humidity sensor • U210A:86: Invalid data (windshield temperature) received from humidity sensor
Detection condition	• Climate control unit receives the invalid data from the front body control module (FBCM).
Fail-safe function	B11F5:86 • Humidity sensor input value (temperature) is fixed at -40 °C {-40 °F}. B1A69:86 • Humidity sensor input value (humidity) is fixed at 100 %. U210A:86 • Humidity sensor input value (windshield temperature) is fixed at -40 °C {-40 °F}.
Possible cause	• Malfunction in the wiring harness between the humidity sensor and front body control module (FBCM) • Malfunction in the wiring harness between the front body control module (FBCM) and instrument cluster • Malfunction in the wiring harness between the instrument cluster and climate control unit • Humidity sensor malfunction • Instrument cluster malfunction • Front body control module malfunction • Climate control unit malfunction
System wiring diagram	Not applicable

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

PERFORM CLIMATE CONTROL UNIT DTC INSPECTION

•  Clear the DTC from the climate control unit memory using the M-MDS.
(See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Perform the DTC inspection for the climate control unit using the M-MDS.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Is DTC U0155:00 or U0423:68 displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC U0010:88, U0155:00 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

(See DTC U0423:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

No

Go to the next step.

2

PERFORM FRONT BODY CONTROL MODULE FBCM) DTC INSPECTION

•  Perform the front body control module (FBCM) DTC inspection using the M-MDS.
(See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)

No

Go to the next step.

3

PERFORM INSTRUMENT CLUSTER DTC INSPECTION

•  Perform the instrument cluster DTC inspection using the M-MDS.
(See DTC INSPECTION [INSTRUMENT CLUSTER].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

4

VERIFY TROUBLESHOOTING COMPLETED

•  Clear the DTC from the climate control unit memory using the M-MDS.
(See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Perform the DTC inspection for the climate control unit using the M-MDS.
(See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

•  Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the climate control unit.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Go to the next step.

No

Go to the next step.

5

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Verify other DTCs displayed.

•  Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

No

DTC troubleshooting completed.

STEP	INSPECTION		ACTION
1	PERFORM CLIMATE CONTROL UNIT DTC INSPECTION • Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is DTC U0155:00 or U0423:68 displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC U0010:88, U0155:00 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) (See DTC U0423:68 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
1		No	Go to the next step.
2	PERFORM FRONT BODY CONTROL MODULE FBCM) DTC INSPECTION • Perform the front body control module (FBCM) DTC inspection using the M-MDS. (See DTC INSPECTION [FRONT BODY CONTROL MODULE (FBCM)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
2		No	Go to the next step.
3	PERFORM INSTRUMENT CLUSTER DTC INSPECTION • Perform the instrument cluster DTC inspection using the M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [INSTRUMENT CLUSTER].)
3		No	Go to the next step.
4	VERIFY TROUBLESHOOTING COMPLETED • Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) Go to the next step.
4		No	Go to the next step.
5	VERIFY THAT NO OTHER DTCs ARE PRESENT • Verify other DTCs displayed. • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
5		No	DTC troubleshooting completed.