Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
  - Front air control (with manual air conditioning system)
  - A/C auto amp. (with automatic air conditioning system)
Is the inspection result normal?

YES

GO TO STEP 2 .

NO

Repair the terminal and connector.

CHECK HARNESS FOR OPEN CIRCUIT

Disconnect the following harness connectors.
- Front air control (with manual air conditioning system)
- A/C auto amp. (with automatic air conditioning system)

Check the resistance between the front air control harness connector or the A/C auto amp. harness connector terminals.

With manual air conditioning system

Front air control harness connector			Resistance (Ω)
Connector No.	Terminal No.
M132	1	17	Approx. 54 - 66

With automatic air conditioning system

A/C auto amp. harness connector			Resistance (Ω)
Connector No.	Terminal No.
M137	1	21	Approx. 54 - 66

Is the measurement value within the specification?

YES

GO TO STEP 3 .

Repair the front air control or the A/C auto amp. branch line.

CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the front air control or the A/C auto amp. Refer to the following.
- Automatic air conditioner: Diagnosis Procedure
- Manual air conditioner: Diagnosis Procedure
Is the inspection result normal?

YES

Replace the front air control or the A/C auto amp. Refer to the following.
- Automatic air conditioner: Removal and Installation
- Manual air conditioner: Removal and Installation
YES

Error was detected in the front air control or the A/C auto amp. branch line.

NO

Repair the power supply and the ground circuit.