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Mitsubishi B1477

dimming (anti-dazzling) inside rearview mirror due to a short in its electrical connector. The auto-dimming mirror is using the reverse signal from the CVT to disable the d

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Mitsubishi dealer or qualified service provider for diagnosis, especially if the SRS warning light is on, the reverse camera remains active in Park, fuses are blown, or the audio display is black.
Confidence95%

Quick answer

B1477 is documented by Mitsubishi/NHTSA as an SRS ECU DTC that may occur when an auto-dimming inside rearview mirror electrical connector has a short. The condition is linked to an incorrect reverse-camera-on condition and may also involve other warning lights, DTCs, display concerns, or blown fuses.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does B1477 mean?

B1477 is documented by Mitsubishi/NHTSA as an SRS ECU DTC that may occur when an auto-dimming inside rearview mirror electrical connector has a short. The condition is linked to an incorrect reverse-camera-on condition and may also involve other warning lights, DTCs, display concerns, or blown fuses.

2. Technical explanation

Verified evidence states that the auto-dimming (anti-dazzling) inside rearview mirror uses the CVT reverse signal to disable mirror dimming. A short in the mirror electrical connector can cause the described fault condition. The supplied bulletin evidence identifies B1477 as a DTC that may be stored in the SRS ECU.

3. What system is affected?

Auto-dimming inside rearview mirror electrical connector; reverse-signal-related operation; SRS ECU (when B1477 is present).

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • Reverse camera may be ON even though the selector lever is in Park.
  • The condition may be intermittent or present continuously.
  • SRS warning light may be ON when B1477 is present in the SRS ECU.
  • Audio display may be inoperative or have a black screen.
  • ETACS fuse No. 18 (7.5 A) may be blown.
  • Fuse No. 16 (10 A) may be blown.

6. Possible causes

  • Verified bulletin evidence identifies a short in the electrical connector of the auto-dimming (anti-dazzling) inside rearview mirror.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Arrange diagnosis by a qualified Mitsubishi service provider, particularly if the SRS warning light is illuminated.
  • Do not attempt high-voltage-system repairs; the supplied evidence does not identify a high-voltage fault or high-voltage repair procedure.
  • Record whether the reverse camera stays on in Park, whether the display is black, and whether warning lights are illuminated to assist diagnosis.

10. Step-by-step troubleshooting

  1. A service diagnosis may identify DTC B1477 in the SRS ECU.
  2. The bulletin evidence also notes that DTC P0705 may be present in the TCM.
  3. For 2018 model-year and newer vehicles equipped with FCM, DTC C1747 may be present in the FCM.
  4. The verified cause identified by the bulletin is a short in the auto-dimming mirror electrical connector.

11. When to contact service

Contact a Mitsubishi dealer or qualified service provider for diagnosis, especially if the SRS warning light is on, the reverse camera remains active in Park, fuses are blown, or the audio display is black.

12. What the service center may check

  • Check for DTC B1477 in the SRS ECU.
  • Check for DTC P0705 in the TCM.
  • For 2018 model-year and newer vehicles with FCM, check for DTC C1747 in the FCM.
  • Inspect and diagnose the auto-dimming inside rearview mirror electrical connector for the short described in the bulletin.
  • Assess the reported reverse-camera, audio-display, and fuse conditions.

13. Possible repair or resolution

  • Not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • NHTSA Manufacturer Communication PDF 10169006, Mitsubishi Technical Tip TT253, published November 26, 2019. The supplied evidence associates the condition with a short in the auto-dimming inside rearview mirror electrical connector.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified official source: NHTSA Manufacturer Communication PDF 10169006, Mitsubishi Technical Tip TT253: https://static.nhtsa.gov/odi/tsbs/2019/MC-10169006-9999.pdf

19. Frequently asked questions

What does Mitsubishi DTC B1477 mean?

The supplied verified evidence associates B1477 with a short in the electrical connector of the auto-dimming inside rearview mirror. It notes that B1477 may be present in the SRS ECU.

Can B1477 cause the reverse camera to stay on in Park?

The verified bulletin states that the reverse camera may be on even when the selector lever is in Park, and that this may occur because of a short in the auto-dimming mirror electrical connector.

Is B1477 related to the SRS warning light?

Yes. The supplied bulletin states that, in some cases, the SRS warning light may be on due to B1477 in the SRS ECU.

Which vehicles are covered by the supplied applicability evidence?

Mitsubishi Outlander and Mitsubishi i-MiEV, model years 2012 through 2020, United States. Applicability is supplied with 0.95 confidence.

20. Sources & verification

Verified
Mitsubishi B1477: dimming (anti-dazzling) inside rearview mirror due… | EV Diagnostics