Chery Tiggo 5 (T21). Manual - part 332

31–

32

31

DTC

B2126

AC Ambient Temperature Sensor Short to Ground or 
Open Circuit 

ET21310100

HVAC 
CONTROL 
PANEL

K-012

BATTERY

RF10

7.5A

RF21

10A

IGNITION SWITCH
   ON OR START

10

21

1

2

3

4

5

6

7

8

9 10 11 12

13

85

85

87

87 30

87 30

30

86

86

85

86

14 15 16 17 18 19 20 21 22 23 24

25

27

26

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

W

K-012

22 21 20

18

19

17 16 15

13

14

12 11 10

8

9

7

6

5

3

4

2

1

B

I-039

B

I-007

2

WB

BR

4

21

WV

19

Y

INSTRUMENT 
PANEL FUSE 
AND RELAY 
BOX

I-007

I-039

K-007

4

B

BrW

8

I-039

K-007

I-037

W

K-007

1

2

3

4

5

6

8

9

10 11

13 14

15 16

18

17

21

20

22

7

12

19

38

V

VW

22

1

2

YW

Y

YW

BlW

LW

15

14

1

2

3

4

5

6

7

8

9 10

11

12

13

14 15

W

B

E-027

E-047

1

2

E-027

I-034

I-039

K-007

3

9

OUTSIDE 
TEMPERATURE
SENSOR

E-047

31–

33

31

Diagnosis Procedure

Use the circuit diagram as a guide to perform the following procedures:
a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable.
c. Disconnect the HVAC control panel assembly connector K-012 and A/C wire harness connector K-007.
d. Disconnect the instrument panel wire harness connectors I-039 and I-034.
e. Disconnect the engine compartment wire harness connector E-027 and outside temperature sensor 

connector E-047. 

f. Check if wire harnesses are worn, pierced, pinched or partially broken.
g. Look for broken, bent, protruded or corroded terminals.
h. Check if related connector pins are in good condition.

a. Remove the outside temperature sensor.
b. Install the new outside temperature sensor to vehicle.
c. Use X-431 3G diagnostic tester to check if DTCs are still output.

DTC Code

DTC Definition

DTC Detection 

Condition

Possible Cause

B2126

AC Ambient 
Temperature Sensor 
Short to Ground or 
Open Circuit 

Ignition switch ON

 Outside temperature sensor  
 Wire harness and connector 
 HVAC control panel 

CAUTION

 When performing electrical equipment diagnosis and test, always refer to the circuit diagram for related 

circuit and component information. 

1

Check wire harness and connector

Repair or replace related wire harness and 
connector

NG

2

Check outside temperature sensor

OK

Replace outside temperature sensor

NO

YES

31–

34

31

a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable.
c. Disconnect the HVAC control panel assembly connector 

K-012 and outside temperature sensor connector E-047.

d. Using a digital multimeter, check for continuity between 

terminals of connector K-012 and connector E-047 to 
check if there is an open in system according to the table 
below.
Standard Condition

e. Disconnect the instrument panel wire harness connectors 

I-039 and I-034.

f. Disconnect the engine compartment wire harness 

connector E-027 and A/C wire harness connector K-007.

g. Using a digital multimeter, check for continuity between 

terminals of connector K-012 and connector K-007 to 
check if there is an open in system according to the table 
below.
Standard Condition

3

Check wire harness and connector (HVAC control panel assembly - outside temperature 
sensor)

RT21311070

-

+

K-012

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

E-047

1

2

Multimeter 

Connection

Condition

Specified 

Condition

K-012 (38) - 

E-047 (1)

Always

Continuity

K-012 (22) - 

E-047 (2)

Always

Continuity

RT21311080

-

+

K-012

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

K-007

1

2

3

4

5

6

8

9

10 11

13 14

15 16

18

17

21

20

22

7

12

19

Multimeter 

Connection

Condition

Specified 

Condition

K-012 (38) - 

K-007 (3)

Always

Continuity

K-012 (22) - 

K-007 (9)

Always

Continuity

31–

35

31

h. Using a digital multimeter, check for continuity between 

terminals of connector I-039 and connector I-034 to 
check if there is an open in system according to the table 
below.
Standard Condition

i. Using a digital multimeter, check for continuity between 

terminals of connector E-027 and connector E-047 to 
check if there is an open in system according to the table 
below.
Standard Condition

RT21311090

-

+

22 21 20

18

19

17 16 15

13

14

12 11 10

8

9

7

6

5

3

4

2

1

I-039

1

2

9

10

11

12

13

14

15

3

4

5

6

7

8

I-034

Multimeter 

Connection

Condition

Specified 

Condition

I-039 (3) - I-034 

(15)

Always

Continuity

I-039 (9) - I-034 

(14)

Always

Continuity

RT21311100

-

+

E-047

1

2

1

2

3

4

5

6

7

8

9 10

11

12

13

14 15

E-027

Multimeter 

Connection

Condition

Specified 

Condition

E-027 (15) - 

E-047 (1)

Always

Continuity

E-027 (14) - 

E-047 (2)

Always

Continuity

Repair or replace related wire harness and 
connector

NG

OK