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2008 - MX-5 - Body and Accessories

DTC B1317/B1318 [POWER RETRACTABLE HARDTOP]



DTC

B1317

Battery power supply voltage increases (17.5 V or more)

B1318

Battery power supply voltage decreases (less than 7.5 V)

DETECTION CONDITION

  • If the power retractable hardtop control module power supply voltage is not within 7.5―17.5 V.

NOTE:

  • The system recovery condition after detecting DTC B1317/1318 is that the battery voltage is in the 8.5―16.5 V range. Verify that the battery voltage is 8.5―16.5 V when inspecting.

POSSIBLE CAUSE

  • Open or short circuit in wiring harness between battery and power retractable hardtop control module

  • ROOM 15 A fuse malfunction

  • Power retractable hardtop control module malfunction

  • Battery malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT FUSE
  • Remove the ROOM 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 8.5 V―16.5 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 POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Turn the ignition switch to the ON position.

  • Measure the power retractable hardtop control module terminal 1X voltage.

  • Is the voltage 8.5 V―16.5 V?

Yes

Replace the power retractable hardtop control module.

(See POWER RETRACTABLE HARDTOP CONTROL MODULE REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.




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