Mitsubishi Montero (2002-2004). Manual - part 784

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-5

51

Driver's air bag module (squib ignition drive circuit) system 
detected short circuit

P.52Bb-13

 

52

Driver's air bag module (squib ignition drive circuit) system 
detected open circuit

P.52Bb-13

 

54

Passenger’s (front) air bag module (squib ignition drive 
circuit) system detected short circuit

P.52Bb-13

55

Passenger’s (front) air bag module (squib ignition drive 
circuit) system detected open circuit

P.52Bb-13

56

Driver’s seat belt pre-tensioner (squib ignition drive circuit) 
system detected short 

P.52Bb-13

 

57

Driver’s seat belt pre-tensioner (squib ignition drive circuit) 
system detected open 

P.52Bb-13

 

58

Passenger’s (front) seat belt pre-tensioner (squib ignition 
drive circuit) system detected short 

P.52Bb-13

 

59

Passenger’s (front) seat belt pre-tensioner (squib ignition 
drive circuit) system detected open 

P.52Bb-13

 

61

Driver's air bag module (squib) system fault for power 
supply circuit (Short-circuited to power supply)

P.52Bb-77

 

62

Driver's s air bag module (squib) system fault for ground 
circuit (Short-circuited to ground)

P.52Bb-82

64

Passenger’s (front) air bag module (squib) system fault for 
power supply circuit (Short-circuited to power supply)

P.52Bb-87

 

65

Passenger’s (front) air bag module (squib) system fault for 
ground circuit (Short-circuited to ground)

P.52Bb-91

66

Driver's seat belt pre-tensioner (squib) system fault for 
power supply circuit (Short-circuited to power supply)

P.52Bb-95

67

Driver's seat belt pre-tensioner (squib) system fault for 
ground circuit (Short-circuited to ground)

P.52Bb-99

68

Passenger’s (front) pre-tensioner (squib) system fault for 
power supply circuit (Short-circuited to power supply)

P.52Bb-103

69

Passenger’s (front) pre-tensioner (squib) system fault for 
ground circuit (Short-circuited to ground)

P.52Bb-107

71*

2

Right hand side-airbag module (squib) system fault 1 (Short 
circuit between terminals of the squib circuit)

P.52Bb-111

72*

2

Right hand side-airbag module (squib) system fault 2 (Open 
in the squib circuit)

P.52Bb-117

73

Right hand side-airbag module (squib) system detected 
short circuit

P.52Bb-13

74

Right hand side-airbag module (squib) system detected 
open circuit

P.52Bb-13

75

Right hand side-airbag module (squib) system fault power 
supply circuit (Short-circuited to power supply)

P.52Bb-120

76

Right hand side-airbag module (squib) system fault ground 
circuit (Short-circuited to ground)

P.52Bb-124

DIAGNOSTIC 
TROUBLE CODE 
NO.

INSPECTION ITEM

REFERENCE PAGE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-6

NOTE: 

.

1. *1: If the vehicle condition returns to normal, the DTC will be automatically erased, and the SRS warning 

light will return to normal.

2. *2: However, if no DTC resets, the SRS warning light will be switched off (The DTC will be retained).
3. If the vehicle has a discharged battery, it will store the DTC 41 or 42. When these DTC are read, check the 

battery.

79

Left hand side-airbag module (squib) system fault 5 for 
power supply circuit

P.52Bb-128

81*

2

Left hand side-airbag module (squib) system fault 1 (Short 
circuit between terminals of the squib circuit)

P.52Bb-131

82*

2

Left hand side-airbag module (squib) system fault 2 (Open 
in the squib circuit)

P.52Bb-137

83

Left hand side-airbag module (squib) system fault 3 for 
ignition drive circuit

P.52Bb-13

84

Left hand side-airbag module (squib) system fault 4 for 
ignition drive circuit

P.52Bb-13

 

85

Left hand side-airbag module (squib) system fault power 
supply circuit (Short-circuited to power supply)

P.52Bb-140

 

86

Left hand side-airbag module (squib) system fault ground 
circuit (Short-circuited to ground)

P.52Bb-144

89

Right hand side-airbag module (squib) system fault 5 for 
power supply circuit

P.52Bb-128

91*

1

Left hand side-impact sensor power supply circuit system

P.52Bb-151

92

Left hand side-impact sensor system for fault 1

P.52Bb-154

93

Left hand side-airbag module (squib) system fault 6 for 
communication system

P.52Bb-128

 

94*

1

Right hand side-impact sensor power supply circuit system

P.52Bb-155

95

Right hand side-impact sensor system for fault 1

P.52Bb-154

96

Right hand side-airbag module (squib) system fault 6 for 
communication system

P.52Bb-128

 

DIAGNOSTIC 
TROUBLE CODE 
NO.

INSPECTION ITEM

REFERENCE PAGE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-7

TROUBLE SYMPTOM CHART

M1524003400343

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC 11: Front impact sensor system circuit short
DTC 12: Front impact sensor system either circuit open or on power supply
DTC 13: Front impact sensor system detects either both are open or no power supply

SYMPTOMS

INSPECTION PROCEDURE NO. REFERENCE PAGE

Communication with scan tool MB991502 is not 
possible (Communication with all systems is not 
possible).

-

GROUP 13A, 
DIAGNOSIS 

P.13Ad-2

.

Communication with scan tool MB991502 is not 
possible (Communication is not possible with 
SRS).

1

 

P.52Bb-158

When the ignition switch is turned to the "ON" 
position (engine stopped), the SRS warning 
light does not illuminate.

Refer to DTC No.43.

 

P.52Bb-66

After the ignition switch is turned to the "ON" 
position the SRS warning light does not go off 
within approximately seven seconds.

Refer to DTC No.43.

 

P.52Bb-71

AC102902AB

Front Impact Sensor Circuit

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DIAGNOSIS

52Bb-8

.

CIRCUIT OPERATION

• When the left and right front impact sensors 

detect a collision, the switches inside the sensors 
turns ON. 

• SRS-ECU judges how severe a collision is by 

detecting signals from the front impact sensors 
and the analog G-sensor. If the impact is over a 
predetermined level, the SRS-ECU outputs an 
ignition signal. At this time, if the safing G-sensor 
is on, the SRS air bag will inflate. 

.

DTC SET CONDITIONS
These DTC are set if there is abnormal resistance 
between the input terminals of the front impact sen-
sors. 
The most likely causes for these codes to be set are 
shown in the table below: 

.

TROUBLESHOOTING HINTS

• Malfunction of the front impact sensor

• Damaged wiring harnesses or connectors 

• Malfunction of the SRS-ECU 

AC204229

CONNECTOR: A-23

AB

A-23 (Y)

AC204228

CONNECTOR: A-30

AB

A-30 (Y)

AC204230

CONNECTOR : D-28

AB

D-28

ACX01478 AG

CONNECTOR: E-08

E-08 (Y)

DTC

SYMPTOMS

11

• Short circuit in front impact sensor or harness

• Short circuit in front impact sensor harness leading to the vehicle body 

ground 

• Short circuit in front impact sensor harness leading to the power supply 

12

• Open circuit in either left or right from impact sensor or harness 

• Short circuit in front impact sensor harness leading to the power supply 

13

• Open circuit in both left and right front impact sensor or harness

• Short circuit in front impact sensor harness leading to the power supply