Chery Tiggo 5 (T21). Manual - part 364

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ET21320080

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Gr

I-046

SRS 
CONTROL 
MODULE

I-046

IGNITION SWITCH

ON OR START

10A

RF08

INSTRUMENT 
PANEL FUSE 
AND RELAY BOX

I-007

B

I-045

16

1

2

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87 30

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B

I-007

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W

I-006

BR

BR

B

B

B

1

2

20

15

I-045

11

FRONT 
PASSENGER 
SEAT BELT 
SWITCH

1

2

I-006

B

B-050

B-050

B-003

I-006

B-003

8

R

R

1

4

I-036

B-055

*2

B-072

16 15 14 13 12 11 10

8

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2

1

9

W

I-036

*2: SRS control module connector is B-072

*1: SRS control module connector is I-046

B

B-072

*1

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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. Turn ignition switch to LOCK, disconnect the negative battery cable and wait for at least 90 seconds. 
b. Disconnect front passenger seat belt switch connector, and connect the new front passenger seat belt 

switch connector to connector B-050. 

c. Reconnect the negative battery cable and wait for a few seconds.
d. Turn ignition switch ON and wait for at least 90 seconds.
e. Use X-431 3G diagnostic tester to clear the DTCs.
f. Turn ignition switch to LOCK.
g. Turn ignition switch ON and wait for at least 90 seconds.
h. Use X-431 3G diagnostic tester to check if the DTCs are still output.

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 front passenger seat belt switch connector B-050 and SRS control module assembly 

connector I-046/B-072.

c. Disconnect the body wire harness connector B-003 and instrument panel wire harness connector I-006 

(*1).

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

B1231-12

Buckle Switch Front 
Passenger (BLFP) 
Circuit Short to Battery 

Ignition switch ON

ON

 Front passenger 

seat belt switch

 Wire harness and 

connector

 SRS control 

module assembly

B1231-1C

Buckle Switch Front 
Passenger (BLFP) 
Circuit Voltage Out of 
Range

1

Check front passenger seat belt switch

Replace front passenger seat belt switch

NO

2

Check wire harness and connector

YES

Repair or replace instrument panel/body 
wire harness and connector

NG

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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 front passenger seat belt switch 

connector B-050 and 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 voltage between 

front passenger seat belt switch connector B-050 and 
body ground to check for a short circuit to power supply 
according to the table below.
Standard Voltage

f. Turn ignition switch to LOCK, disconnect the negative 

battery cable and wait for at least 90 seconds. 

g. Using a digital multimeter, check for continuity between 

front passenger seat belt switch connector B-050 and 
body ground to check for a short circuit to ground 
according to the table below.
Standard Condition

3

Check front passenger seat belt switch control circuit

OK

RT21320320

-

+

V

1

2

B-050

Multimeter 

Connection

Condition

Specified 

Condition

B-050 (1) - Body 

ground

Ignition switch ON

Below 1 V

-

+

RT21320330

1

2

B-050

Multimeter 

Connection

Condition

Specified 

Condition

B-050 (1) - Body 

ground

Always

No continuity

Replace SRS control module assembly

OK

NG

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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 instrument panel wire harness connector 

I-006 and SRS control module assembly connector I-046/ 
(*1).

c. Using a digital multimeter, check for continuity between 

the terminals of connector I-006 and connector I-046 
according to the table below.
Standard Condition

a. Turn ignition switch to LOCK, disconnect the negative 

battery cable and wait for at least 90 seconds.

b. Disconnect front passenger seat belt switch connector B-

050 and SRS control module assembly connector I-046/
B-072.

c. Using a digital multimeter, check for continuity between 

the terminals of connector B-050 and connector I-046/B-
072 according to the table below.
Standard Condition

4

Check front passenger seat belt switch wire harness and connector (SRS control module 
assembly - instrument panel wire harness connector)

-

+

RT21320340

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I-046

1

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I-006

Multimeter 

Connection

Condition

Specified 

Condition

I-006 (15) - I-046 

(20)

Always

Continuity

Replace instrument panel wire harness 
and connector

NG

5

Check wire harness and connector (SRS control module assembly - front passenger seat 
belt switch)

OK

-

+

RT21320341

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B-072

I-046

1

2

B-050

Multimeter 

Connection

Condition

Specified 

Condition

B-050 (1) - I-046/

B-072 (20)

Always

Continuity

Replace body wire harness and connector

NG