Chery Tiggo 5 (T21). Service manual — part 329

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b. Automatic A/C

Self-diagnosis operation: press the A/C + inner/outer circulation button for more than 5 seconds.
Malfunction display: Switch DVD to FM mode, set the driver A/C temperature to 29.5°C and long press
the A/C + inner/outer circulation button for more than 5 seconds to enter self-diagnosis mode.
Automatic controller background automatically performs self-checking, runs the A/C system actuators
and sensors, and then shows the malfunction code by DVD screen (other information is not
shown).The system automatically exits self-checking after displaying the code for 5 seconds (power on
can force the diagnosis function to end). If there is no malfunction, it will display 00, and 5 seconds
later, it will exit self-diagnosis mode. System enters the state before diagnosis after exiting



self-diagnosis mode.
Detail correspondence of codes and malfunction is as follows:

3. Malfunction Compensation Function

To guarantee the proper work of A/C system, when the controller detects an invalid or defect sensor in A/C
system, the system will work based on the sensor failure alternative value.
Definition of sensor failure alternative value is as follows:

Code

Content

Code

Content

00

No malfunction, system operates
properly

12

Circulation damper motor
malfunction (invalid adjustment)

01

Outside temperature sensor
malfunction (open or short)

13

Left mode damper motor malfunction
(invalid adjustment)

02

Left room temperature sensor
malfunction (open or short)

14

Reserve

03

Right room temperature sensor
malfunction (open or short)

15

Left mix damper motor malfunction
(invalid adjustment)

04

Left sun sensor malfunction (open or
short)

16

Right mix damper motor malfunction
(invalid adjustment)

05

Right sun sensor malfunction (open
or short)

17

Reserve

06

Reserve

18

Reserve

07

Reserve

19

Reserve

08

Evaporator temperature sensor
malfunction (short or open)

20

Reserve

09

Heater core sensor malfunction
(short or open)

21

Control panel CAN communication
malfunction (CAN communication
interrupted)

10

Reserve

22

Communication with BCM
malfunction

11

Blower malfunction (invalid
adjustment)

Description

Failure Alternative

Value

Description

Failure Alternative

Value

Outside Temperature Sensor

25°C

Heater Sensor

85°C

Room Temperature Sensor

25°C

Evaporator Sensor

0°C

Sun Sensor

0 W/m2

Vehicle Seed Sensor

10 km/h

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DTC Confirmation Procedure

Confirm that the battery voltage is normal before performing the following procedures.
 Turn ignition switch to LOCK.
 Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC).
 Turn ignition switch ON.
 Using X-431 3G diagnostic tester to record and clear the DTCs stored in the A/C control module assembly.
 Turn ignition switch to LOCK and wait for a few seconds.
 Using X-431 3G diagnostic tester to select "Read Code".
 If DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
 If DTC is not detected, the malfunction indicated by the DTC is intermittent. Please refer to Intermittent

DTC Troubleshooting.

Intermittent DTC Troubleshooting

If the malfunction is intermittent, perform the followings:
 Check if connectors are loose.
 Check if wire harnesses are worn, pierced, pinched or partially broken.
 Wiggle related wire harnesses and connectors and observe if signal is interrupted in the related circuit.
 If possible, try to duplicate the conditions under which the DTC was set.
 Look for the data that has changed or the DTC to be reset during the wiggle test.
 Look for broken, bent, protruded or corroded terminals.
 Inspect the A/C system sensors and mounting areas for damage, foreign matter, etc. that will cause

incorrect signals.

 Check and clean all wire harness connectors and grounding parts related to the current DTC.
 Remove the A/C control panel assembly from the malfunctioning vehicle and install it to a new vehicle and

perform a test. If DTC cannot be cleared, the A/C control panel assembly is malfunctioning. If DTC can be
cleared, reinstall the A/C control panel assembly to original vehicle.

 If multiple trouble codes were set, refer to the circuit diagrams to look for any common ground circuit or

power supply circuit applied to the DTC.

 Refer to Technical Bulletin that is applied to the malfunction.

Ground Inspection

Groundings are very important to the proper operation of circuits. Ground points are often exposed to
moisture, dirt and other corrosive environments. Corrosion (rust) can increase load resistance. This situation
may change the way in which a circuit works.
Circuits are very sensitive to proper grounding. A loose or corroded ground may seriously affect the control
circuit. The operations to check the ground points are as follows:
1. Remove the ground bolt or nut.
2. Check all contact surfaces for tarnish, dirt, rust, etc.
3. Clean as necessary to ensure that contacting is in a good condition.
4. Reinstall the ground bolt or nut securely.
5. Check if add-on accessories interfere with the ground circuit.
6. If several wire harnesses are crimped into one ground terminal, check if they are installed correctly. Make

sure all wire harnesses are clean, securely fastened and providing a good ground path.

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Diagnostic Trouble Code (DTC) Chart

DTC Code

DTC Definition

B2133

AC Solar Sensor Short to Ground or Open Circuit (Left Side)

B2134

AC Solar Sensor Short to Ground or Open Circuit (Right Side)

B2120

AC in Car Temperature Sensor Short to Ground or Open Circuit (Left Side)

B2121

AC in Car Temperature Sensor Short to Ground or Open Circuit (Right Side)

B2126

AC Ambient Temperature Sensor Short to Ground or Open Circuit

B2127

AC Evaporator Temperature Sensor Short to Ground or Open

B2135

AC Heater Core Sensor Short to Ground Or Open Circuit

B2160

Error of AC Mix Actuator (Left Side)

B2163

Error of AC Mix Actuator (Right Side)

B2166

Error of AC Mode Actuator

B2169

Error of AC Blower Actuator

B2172

AC Recirculation Actuator

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DTC

B2133

AC Solar Sensor Short to Ground or Open Circuit (Left
Side)

DTC

B2134

AC Solar Sensor Short to Ground or Open Circuit (Right
Side)

ET21310080

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

37

3

4

1

GW

YR

36

GL

G

30

VB

lW

1

2

3

4

B

I-021

SUN SENSOR

I-021

5

6

16