Nissan Frontier. Manual - part 982

LAN-78

< DTC/CIRCUIT DIAGNOSIS >

[CAN]

HVAC BRANCH LINE CIRCUIT

HVAC BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000009479137

1.

CHECK CONNECTOR

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Check the terminals and connectors of the front air control for damage, bend and loose connection (unit

side and connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1. Disconnect the connector of front air control.

2. Check the resistance between the front air control harness connector terminals.

-

With auto A/C models

-

With manual A/C models

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the front air control branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the front air control. Refer to .

• Auto A/C models: 

HAC-59, "Front Air Control Power and Ground Diagnosis Procedure"

• Manual A/C models: 

HAC-128, "Front Air Control Power and Ground Diagnosis Procedure"

Is the inspection result normal?

YES (Present error)>>Replace the front air control. Refer to 

VTL-7, "Removal and Installation"

.

YES (Past error)>>Error was detected in the front air control branch line.

NO

>> Repair the power supply and the ground circuit.

Front air control harness connector

Resistance (

Ω)

Connector No.

Terminal No.

M56

37

36

Approx. 54 – 66

Front air control harness connector

Resistance (

Ω)

Connector No.

Terminal No.

M59

37

36

Approx. 54 – 66

LAN

4WD BRANCH LINE CIRCUIT

LAN-79

< DTC/CIRCUIT DIAGNOSIS >

[CAN]

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4WD BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000009479138

1.

CHECK CONNECTOR

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Check the terminals and connectors of the transfer control unit for damage, bend and loose connection

(unit side and connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1. Disconnect the connector of transfer control unit.

2. Check the resistance between the transfer control unit harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the transfer control unit branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the transfer control unit. Refer to 

DLN-21, "Diagnosis Proce-

dure"

.

Is the inspection result normal?

YES (Present error)>>Replace the transfer control unit. Refer to 

DLN-92, "Removal and Installation"

.

YES (Past error)>>Error was detected in the transfer control unit branch line.

NO

>> Repair the power supply and the ground circuit.

Transfer control unit harness connector

Resistance (

Ω)

Connector No.

Terminal No.

M152

1

2

Approx. 54 – 66

LAN-80

< DTC/CIRCUIT DIAGNOSIS >

[CAN]

A-BAG BRANCH LINE CIRCUIT

A-BAG BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000009479139

WARNING:

Always observe the following items for preventing accidental activation.

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait 3 minutes

or more. (To discharge backup capacitor.)

• Never use unspecified tester or other measuring device.

1.

CHECK CONNECTOR

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Check the terminals and connectors of the air bag diagnosis sensor unit for damage, bend and loose con-

nection (unit side and connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the main harness.

2.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

Check the air bag diagnosis sensor unit. Refer to 

SRC-3, "Work Flow"

.

Is the inspection result normal?

YES

>> Replace the main harness.

NO

>> Replace parts whose air bag system has a malfunction.

LAN

BCM BRANCH LINE CIRCUIT

LAN-81

< DTC/CIRCUIT DIAGNOSIS >

[CAN]

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BCM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000009479140

1.

CHECK CONNECTOR

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and

connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1. Disconnect the connector of BCM.

2. Check the resistance between the BCM harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the BCM branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the BCM. Refer to 

BCS-27, "Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the BCM. Refer to 

BCS-49, "Removal and Installation"

.

YES (Past error)>>Error was detected in the BCM branch line.

NO

>> Repair the power supply and the ground circuit.

BCM harness connector

Resistance (

Ω)

Connector No.

Terminal No.

M18

39

40

Approx. 54 – 66