B1138 - Diagnosis Sensor Unit

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3

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Possible causes

Faulty Diagnosis Sensor Unit

Diagnosis Sensor Unit harness is open or shorted

Diagnosis Sensor Unit circuit poor electrical connection

What does this mean?

Possible symptoms

Air Bag Warning Light ON

B1138 Description

The Air Bag Diagnosis Sensor Unit detects the whole SRS electrical system and displays the malfunction either by illuminating or blinking the air bag warning lamp in the combination meter. The Air Bag Diagnosis Sensor Unit detects a shock that exceeds specified level and watches such systems as the driver and passenger air bag, side air bag, curtain air bag, pre-tensioner seat belts and Occupant Classification System (OCS) operate properly.

The Air Bag Diagnosis Sensor Unit contains the “G” sensors for both frontal and side collisions and spare battery function in case of main battery damaged in a collision.

OBDII Code B1138 - Diagnosis Sensor Unit - AutoCodes.com

B1138 Information for specific makes

B1138 INFINITI Diagnosis Sensor Unit

B1138 NISSAN Diagnosis Sensor Unit

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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