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2008 - MX-5 - Body and Accessories

DTC B296A/U294B/B293C/B293B [POWER RETRACTABLE HARDTOP]



DTC

B296A

Roof motor pulse signal error (RH)

U294B

Roof motor pulse signal error (LH)

B293C

Deck panel motor pulse signal error (RH)

B293B

Deck panel motor pulse signal error (LH)

DETECTION CONDITION

  • Pulse is not output after the motor drive signal is output.

POSSIBLE CAUSE

  • Foreign material caught in mechanism

  • RHT L 30 A fuse malfunction

  • RHT R 30 A fuse malfunction

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

  • Roof motor malfunction

  • Deck panel motor malfunction

  • Power retractable hardtop control module malfunction


Diagnostic procedure

STEP

INSPECTION

ACTION

1

FOREIGN MATERIAL INSPECTION
  • Is there any malfunction which stops the motor mechanically?

Yes

Go to the next step.

No

Remove foreign material.

2

INSPECT FUSE
  • Remove the RHT L 30 A and RHT R 30 A fuse.

  • Is the fuse normal?

Yes

Go to the next step.

No

Replace the fuse.

3

INSPECT THE ROOF/DECK PANEL MOTOR

Yes

Go to the next step.

No

Replace the roof/deck panel motor.

(See ROOF MOTOR REMOVAL/INSTALLATION.)

(See DECK PANEL MOTOR REMOVAL/INSTALLATION.)

4

INSPECT THE WIRING HARNESS BETWEEN BATTERY AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Turn the ignition switch to the ON position.

  • Refer to the power retractable hardtop control module inspection and measure the voltage between power retractable hardtop control module connector terminals 2A and 2B.

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

  • Are the terminal voltages normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

5

INSPECT THE WIRING HARNESS BETWEEN POWER RETRACTABLE HARDTOP CONTROL MODULE AND GROUND
  • Turn the ignition switch to the LOCK position.

  • Disconnect the negative battery cable.

  • Disconnect the power retractable hardtop control module connector.

  • Inspect for continuity between power retractable hardtop control module terminal 2E and body ground, and terminal 2F and body ground.

  • Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

6

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Disconnect the roof/deck panel motor connector.

  • Disconnect the power retractable hardtop control module connector.

  • Inspect the following wiring harnesses for an open or short circuit.

    • Between power retractable hardtop control module connector terminal 3L and roof motor connector (LH) terminal E, and between power retractable hardtop control module connector terminal 3D and roof motor connector (LH) terminal A

    • Between power retractable hardtop control module connector terminal 3A and roof motor connector (RH) terminal E, and between power retractable hardtop control module connector terminal 3I and roof motor connector (RH) terminal A

    • Between power retractable hardtop control module connector terminal 3H and deck panel motor connector (LH) terminal A, and between power retractable hardtop control module connector terminal 3P and deck panel motor connector (LH) terminal E

    • Between power retractable hardtop control module connector terminal 3M and deck panel motor connector (RH) terminal A, and between power retractable hardtop control module connector terminal 3E and deck panel motor connector (RH) terminal E

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

7

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Disconnect the roof/deck panel motor connector.

  • Disconnect the power retractable hardtop control module connector.

  • Inspect the sensor power supply wiring harness for an open or short circuit.

    • Power retractable hardtop control module connector terminal 1G—Roof motor connector (RH) terminal B

    • Power retractable hardtop control module connector terminal 1G—Roof motor connector (LH) terminal B

    • Power retractable hardtop control module connector terminal 1G—Deck panel motor connector (RH) terminal D

    • Power retractable hardtop control module connector terminal 1G—Deck panel motor connector (LH) terminal D

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

8

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Inspect the sensor communication wiring harness for an open or short circuit.

    • Power retractable hardtop control module connector terminal 1I—Roof motor connector (RH) terminal D

    • Power retractable hardtop control module connector terminal 1M—Roof motor connector (LH) terminal D

    • Power retractable hardtop control module connector terminal 1O—Deck panel motor connector (LH) terminal F

    • Power retractable hardtop control module connector terminal 1K—Deck panel motor connector (RH) terminal F

  • Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness.

9

INSPECT THE WIRING HARNESS BETWEEN ROOF/DECK PANEL MOTOR AND POWER RETRACTABLE HARDTOP CONTROL MODULE
  • Inspect the sensor ground wiring harness for an open or short circuit.

    • Power retractable hardtop control module connector terminal 1Q—Roof motor connector (RH) terminal F

    • Power retractable hardtop control module connector terminal 1Q—Roof motor connector (LH) terminal F

    • Power retractable hardtop control module connector terminal 1Q—Deck panel motor connector (LH) terminal B

    • Power retractable hardtop control module connector terminal 1Q—Deck panel motor connector (RH) terminal B

  • Is the wiring harness normal?

Yes

Replace the power retractable hardtop control module.

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

No

Repair or replace the wiring harness.




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