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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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BACK-UP LIGHT

Purpose

  • The back-up lights signal vehicles to the rear that the vehicle is reversing.

Function

  • The BCM sends the back-up light on request signal sent from the instrument cluster to the electrical supply unit (ESU) and the electrical supply unit (ESU) turns the back-up light on.

Construction

  • The back-up lights are located on the rear bumper.

Operation

Back-up lights (AT)
1. When the selector lever is in the R position with the ignition switched ON (engine off or on), the TCM sends (1) an R position signal to the instrument cluster via CAN communication.
2. When the instrument cluster receives the R position signal, it sends (2) a back-up light on request signal to the BCM.
3. The BCM sends (3) the back-up light on request signal to the electrical supply unit (ESU) via LIN communication.
4. When the electrical supply unit (ESU) receives the back-up light on request signal, it turns the back-up light on (4).

Back-up lights (MT)
1. When the shift lever is in the reverse position, the back-up light switch turns on (1).
2. When the back-up light switch is on with the ignition switched ON (engine off or on), the PCM detects (2) a back-up light switch on signal.
3. The PCM sends (3) the back-up light switch on signal to the instrument cluster via CAN communication.
4. When the instrument cluster receives the back-up light switch on signal, it sends (4) a back-up light on request signal to the BCM.
5. The BCM sends (5) the back-up light on request signal to the electrical supply unit (ESU) via LIN communication.
6. When the electrical supply unit (ESU) receives the back-up light on request signal, it turns the back-up light on (6).

Fail-safe

  • Not applicable

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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