Rear Camera Image Distortion

The Rear Vision Camera or Surround Vision Camera on some 2018 Traverse and Enclave models may have a yellow or blue display (Fig. 13) with a blurry or distorted image (Fig. 14), a display showing only gridlines, or a blue screen with a Service Rear Vision System message displayed. (Fig. 15) These conditions may be present with or without any set DTCs.

 

Fig. 13

 

Fig. 14

 

Fig. 15

 

These camera display conditions may be caused by a poor connection in the camera signal circuits 6972 and/or 6973 (without Surround Vision Camera RPO UVH).

 

The standard rear camera signal circuits 6972 and 6973 run from the B87 Rear Camera to the K188 Human Machine Interface (HMI) bypass module to the K74 HMI module.

 

For the 360 degree Camera system (RPO UVH), the camera signal circuits 6972 and 6973 run from the B87 Rear Camera and the K157 Video Processing Module to the K188 HMI Bypass Module to the K74 HMI Module.

 

If the cause has not been found after performing the normal diagnostics as outlined in the appropriate Service Information, inspect camera signal circuits 6972 and 6973 for an open circuit, high resistance, poor terminal tension, bent terminals (Fig. 16), etc. Replace and/or repair any damaged terminals (Fig. 17), module(s) with bent pins, or wiring as necessary.

 

Fig. 16

 

Fig. 17

 

Image Quality Diagnostic Tips

 

Depending on the lighting and build variation, some image quality conditions may be a normal characteristic rather than a quality issues in the parts, wiring or software.

 

Before replacing any parts, such as the Human Machine Interface (HMI) control module, Human Machine Interface Bypass Module (VBM), or Video Processing Module (VPM), compare the image quality to a like vehicle that is the same model year with the same infotainment RPO and the same rear camera system.

 

If there are DTCs stored, follow the appropriate Service Information diagnostics. Also inspect the following items:

  • Clean the lens of the rear camera with isopropyl alcohol and a soft tissue (to avoid scratching the lens).
  • Check connections at the camera and ensure that there is no corrosion or improper seating of the terminals or connector.
  • Disconnect/reconnect the negative battery cable to determine if it corrects any of the concerns. If so, disconnect/reconnect the VPM, VBM, and/or HMI module one at a time to power cycle the module and isolate which one may be causing the concern.
  • Check for loose connections, bent pins, and/or backed out/loose terminals at the VPM (if equipped), VBM (if equipped), and/or HMI module.
  • Check for excessively taut cables/wiring related to the rear camera system. Wiring/connector repairs may be a necessity in these cases. Do not replace modules if cable wiring is too short or misrouted.
  • Inspect camera signal circuits 6972 and 6973 for any damaged terminal or wiring conditions.

 

– Thanks to James Miller

 

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