Chery Tiggo 5 (T21). Service manual — part 367

32–

59

32

Self-diagnosis Detection Logic

HINT:
When performing electrical diagnosis and test, always refer to the relevant circuit diagram for the special
circuit and component information.

Diagnosis Procedure

a. Using a digital multimeter, check the battery voltage.



Standard voltage: 11 to 14 V

Use circuit diagram as a guide to perform the following procedures:
a. Turn ignition switch to LOCK, disconnect the negative battery cable and wait for at least 90 seconds.
b. Disconnect the SRS control module assembly connector I-046/B-072 and instrument panel fuse and relay

box wire harness connector I-007.

c. Disconnect the body wire harness connector B-055 and instrument panel wire harness connector I-036

(*2).

d. Check if wire harnesses are worn, pierced, pinched or partially broken.
e. Check for broken, bent, protruded or corroded terminals.
f. Check if related connector terminal contact pins are in good condition.

DTC Code

DTC Definition

DTC Detection

Condition

Warning Light

Condition

Possible Cause

B1250-16

Battery Voltage Circuit
Voltage Below
Threshold

Ignition switch ON

ON

 Battery
 Charging system
 Wire harness and

connector

 SRS control

module assembly

B1250-17

Battery Voltage Circuit
Voltage Above
Threshold

1

Check battery

Check charging system (

See page 16-6

)

NG

2

Check wire harness and connector (SRS control module assembly - instrument panel fuse
and relay box)

OK

Repair or replace instrument panel wire
harness and connector

NG

OK

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a. Turn ignition switch to LOCK, disconnect the negative

battery cable and wait for at least 90 seconds.

b. Disconnect the SRS control module assembly connector

I-046/B-072.

c. Connect the negative battery cable and wait for a few

seconds.

d. Turn ignition switch ON.
e. Using a digital multimeter, measure the power supply

voltage of SRS control module assembly connector I-
046/B-072 to check if the system power supply is normal
according to the table below.
Standard Voltage

a. Turn ignition switch to LOCK, disconnect the negative

battery cable and wait for at least 90 seconds.

b. Disconnect the SRS control module assembly connector

I-046/B-072.

c. Using a digital multimeter, measure the ground circuit of

SRS control module assembly connector I-046/B-072 to
check if the system ground is normal according to the
table below.
Standard Condition

3

Check wire harness and connector (SRS control module assembly - battery)

RT21320380

-

+

V

32

31

30

29

28

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

27

26

25

24

23

22

21

20

19

18

17

I-046

B-072

Multimeter

Connection

Condition

Specified

Condition

I-046/B-072 (1) -

Body ground

Ignition switch ON

11 V to 14 V

Repair or replace instrument panel wire
harness and connector

NG

4

Check wire harness and connector (SRS control module assembly - body ground)

OK

-

+

RT21320390

32

31

30

29

28

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

27

26

25

24

23

22

21

20

19

18

17

B-072

I-046

Multimeter

Connection

Condition

Specified

Condition

I-046/B-072 (16) -

Body ground

Always

Continuity

Repair or replace instrument panel wire
harness and connector

OK

NG

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a. Reconnect the SRS control module assembly connector I-046/B-072 securely.
b. Reconnect the instrument panel fuse and relay box wire harness connector I-007 securely.
c. Connect the negative battery cable.
d. Turn ignition switch ON.
e. Use X-431 3G diagnostic tester (the latest software) to record and clear the DTCs stored in the

supplemental restraint system.

f. Turn ignition switch to LOCK and wait for a few seconds.
g. Turn ignition switch ON.
h. Use X-431 3G diagnostic tester to read the DTCs stored in the supplemental restraint system again.
i. Check if the same DTCs are still output.

5

Reconfirm DTCs

System operates normally

NO

YES

Replace SRS control module assembly

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32

Self-diagnosis Detection Logic

HINT:
When performing electrical diagnosis and test, always refer to the relevant circuit diagram for the special
circuit and component information.

Diagnosis Procedure

a. Use X-431 3G diagnostic tester (the latest software) to record and clear the DTCs stored in the

supplemental restraint system.

b. Refer to DTC Confirmation Procedure.
c. Check if the same DTC is output.

a. Turn ignition switch ON.
b. Use X-431 3G diagnostic tester (the latest software) to check if SRS control module assembly setting

matches actual vehicle configuration.

a. Turn ignition switch to LOCK.
b. Disconnect the negative battery cable and wait for at least 90 seconds.
c. Connect the negative battery cable.
d. Turn ignition switch ON.
e. Use X-431 3G diagnostic tester (the latest software) to record and clear the DTCs stored in the

supplemental restraint system.

f. Turn ignition switch to LOCK and wait for a few seconds.

DTC

U1300-55 Software Configuration Error

DTC Code

DTC Definition

DTC Detection

Condition

Warning Light

Condition

Possible Cause

U1300-55

Software Configuration
Error

Ignition switch ON

ON

 Peripherals

configuration error

 SRS control

module assembly

1

Check DTCs

Malfunction indicated by DTC is
intermittent

NO

2

Check SRS control module assembly configuration

YES

Reset SRS control module assembly

NO

3

Reconfirm DTCs

YES