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2008 - MX-5 - Body and Accessories

DTC B296D [POWER RETRACTABLE HARDTOP]



DTC B296D

  • Hall sensor low power supply voltage

DETECTION CONDITION

  • Power supply voltage to the Hall sensor is 5 V or less.

POSSIBLE CAUSE

  • Battery malfunction

  • Open or short circuit in wiring harness between power retractable hardtop control module and roof/deck panel motor

  • Power retractable hardtop control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT THE BATTERY
  • Measure the battery positive voltage.

  • Is the measured voltage 7.5 V or more?

Yes

Go to the next step.

No

The battery has a malfunction.

Inspect the charge/discharge system.

2

INSPECT THE WIRING HARNESS BETWEEN POWER RETRACTABLE HARDTOP CONTROL MODULE AND ROOF/DECK PANEL MOTOR
  • Turn the ignition switch to the LOCK position.

  • Disconnect the negative battery cable.

  • Disconnect the power retractable hardtop control module and roof/deck panel motor connector.

  • Inspect for continuity between power retractable hardtop control module connector terminal 1G and following terminals:

    • Roof motors connector terminal B

    • Deck panel motors connector terminal D

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

3

INSPECT THE POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Connect the negative battery cable.

  • Turn the ignition switch to the ON position.

  • Push the power retractable hardtop switch.

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

  • Is the measured voltage 5.0 V or more?

Yes

DTC troubleshooting completed.

No

Replace the power retractable hardtop control module.

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




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