Infiniti QX56 (Z62). Manual - part 115

BCS-74

< DTC/CIRCUIT DIAGNOSIS >

B26E7 TPMS CAN COMM

B26E7 TPMS CAN COMM

DTC Logic

INFOID:0000000006274839

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION

1.

Erase the DTC.

2.

Turn ignition switch OFF.

3.

Perform the “Self Diagnostic Result” of BCM with CONSULT-III, when passed 2 seconds or more after the
ignition switch is turned ON.

Is any DTC detected?

YES

>> Refer to 

BCS-74, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006274840

NOTE:
If DTC “B26E7” detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to 

BCS-70, "Diagno-

sis Procedure"

.

1.

LOW TIRE PRESSURE WARNING CONTROL UNIT SELF DIAGNOSTIC RESULT 

Perform “Self Diagnostic Result” of low tire pressure warning control unit with CONSULT-III. Refer to 

WT-12,

"CONSULT-III Function"

.

Is any DTC detected?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

LOW TIRE PRESSURE WARNING CONTROL UNIT DIAGNOSIS

Perform low tire pressure warning control unit component diagnosis of detected DTC. Refer to 

WT-18, "DTC

Index"

.

>> GO TO 3.

3.

BCM SELF DIAGNOSTIC RESULT

Erase DTC of BCM, and perform “Self Diagnostic Result” again.

Is DTC “B26E7” detected?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> INSPECTION END

4.

REPLACE LOW TIRE PRESSURE WARNING CONTROL UNIT TEMPORARILY

Remove low tire pressure warning control unit, and install normal low tire pressure warning control unit. 

>> GO TO 5.

5.

BCM SELF-DIAGNOSTIC RESULT

Erase DTC of BCM, and perform “Self Diagnostic Result” of BCM again.

Is DTC “B26E7” detected?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> Replace low tire pressure warning control unit. Refer to 

WT-65, "Removal and Installation"

.

DTC

 CONSULT-III display description

DTC Detection Condition

Probable cause

B26E7

TPMS CAN COMM

When ignition switch is ON, BCM cannot re-
ceived CAN communication signal from low 
tire pressure warning control unit.

• CAN communication system
• Low tire pressure warning control unit
• BCM

BCS

POWER SUPPLY AND GROUND CIRCUIT

BCS-75

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000006274841

1.

CHECK FUSE AND FUSIBLE LINK

Check that the following fuse and fusible link are not blown.

Is the fuse fusing?

YES

>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is

blown.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connectors.

3.

Check voltage between BCM harness connector and ground.

Is the measurement value normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

Signal name

Fuse and fusible link No.

Battery power supply

K

10

Terminals

Voltage

(Approx.)

(+)

(

−

)

BCM

Ground

Connector

Terminal

M70

70

Battery voltage

57

BCM

Ground

Continuity

Connector

Terminal

M70

67

Existed

BCS-76

< DTC/CIRCUIT DIAGNOSIS >

COMBINATION SWITCH OUTPUT CIRCUIT

COMBINATION SWITCH OUTPUT CIRCUIT

Diagnosis Procedure

INFOID:0000000006274842

1.

CHECK OUTPUT 1 - 5 CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect BCM and combination switch connectors.

3.

Check continuity between BCM harness connector and combination switch harness connector.

Does continuity exist?

YES

>> GO TO 2.

NO

>> Repair harnesses or connectors.

2.

CHECK OUTPUT 1 - 5 CIRCUIT FOR SHORT

Check for continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> Repair harnesses or connectors.

NO

>> GO TO 3.

3.

CHECK BCM OUTPUT VOLTAGE

1.

Connect BCM connector.

2.

Check voltage between BCM harness connector and ground.

Is the measurement value normal?

System

BCM

Combination switch

Continuity

Connector

Terminal

Connector

Terminal

OUTPUT 1

M68

36

M27

11

Existed

OUTPUT 2

35

9

OUTPUT 3

34

7

OUTPUT 4

33

10

OUTPUT 5

32

13

System

BCM

Ground

Continuity

Connector

Terminal

OUTPUT 1

M68

36

Not existed

OUTPUT 2

35

OUTPUT 3

34

OUTPUT 4

33

OUTPUT 5

32

System

Terminals

Voltage

(Approx.)

(+)

(

−

)

BCM

Ground

Connector

Terminal

OUTPUT 1

M68

36

7.0 - 8.0 V

OUTPUT 2

35

OUTPUT 3

34

OUTPUT 4

33

OUTPUT 5

32

PKIB4960J

BCS

COMBINATION SWITCH OUTPUT CIRCUIT

BCS-77

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

YES

>> Replace combination switch.

NO

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.