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2008 - MX-5 - Restraints

DTC B1318



DTC

B1318

The power supply voltage decreases (less than 9 V)

DETECTION CONDITION

WARNING:

  • Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection with only detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.

  • When the SAS control module power supply voltage is not within 9ā€•16 V.

POSSIBLE CAUSE

  • Open or short circuit in wiring harness between battery and SAS control module

  • ENGINE 15 A fuse malfunction

  • Battery malfunction

  • SAS control module malfunction


Diagnostic procedure

Step

Inspection

Action

1

INSPECT FUSE
  • Remove the ENGINE 15 A fuse.

  • Is the fuse normal?

Yes

Go to the next step.

No

Replace the fuse.

2

INSPECT BATTERY
  • Measure the battery positive voltage.

  • Is the voltage 9 Vā€•16 V?

Yes

Go to the next step.

No

The battery has a malfunction.

Inspect the charge/discharge system.

3

INSPECT WIRING HARNESS BETWEEN BATTERY AND FUSE BLOCK
  • Turn the ignition switch to the ON position.

  • Measure the main fuse block terminal AB voltage.

  • Is the voltage 9 Vā€•16 V?

Yes

Install the fuse, then go to the next step.

No

Repair the wiring harness between the fuse block and battery.

4

INSPECT MAIN FUSE BLOCK

WARNING:

  • Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the air bag system service warnings and cautions before handling the air bag system components.

    (See AIR BAG SYSTEM SERVICE WARNINGS.)

    (See AIR BAG SYSTEM SERVICE CAUTIONS.)

  • Turn the ignition switch to the LOCK position.

  • Remove the battery cover.

  • Disconnect the negative battery cable and wait for 1 min or more.

    (See BATTERY REMOVAL/INSTALLATION [LF].)

  • Remove the column cover.

  • Disconnect the clock spring connector.

  • Remove the glove compartment.

  • Disconnect the passenger-side air bag module connector.

    (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)

  • Disconnect the driver and passenger-side seat connector.

  • Remove the back trim.

  • Disconnect the driver and passenger-side pre-tensioner seat belt connectors.

  • Disconnect the SAS control module connector.

  • Turn the ignition switch to the ON position.

  • Measure the SAS control module terminal 1W voltage.

  • Is the voltage 9 Vā€•16 V?

Yes

Replace the SAS control module.

(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)

No

Repair the wiring harness between the main fuse block and SAS control module.




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