Headlamp or Instrument Cluster Lights Flickering or Dimming - kw ABS battery BMPV brake charge dim display DRP EBTCM electrical flash flicker generator information IPC JL4 lamp light module operation

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Headlight or instrument panel lights dimming on a vehicle equipped with JL4 during a non-stablitrack event.

Please refer to SI Document 859510 for complete description and operation.

Below is an excerpt from the document that explains that headlight or instrument light dimming or flickering maybe a normal condition.

A VSES brake application may or may not occur after pre-fill is complete. If the EBCM determines that a brake application is no longer pending, the pre-fill pressure is released and the VSES system returns to the normal, monitoring state. The reason that we must understand system pre-fill is that pre-fill may lead to customer concerns. Any time the ABS pump motor is active, the motor draws a large amount of current, and may cause the vehicle lighting systems to dim noticeably. When ABS activity occurs, most drivers understand that this activity is the cause of noises and dimming lights. Likewise, when an actual VSES event occurs, the Stability System Active message is displayed, which helps drivers understand why these other conditions occur. Since pre-fill is not an actual VSES event, but preparation for a pending event, no message is displayed. Also, system noise during pre-fill is very minimal. A customer may become concerned with what is perceived to be an electrical problem, due to the intermittent dimming lights, when, in fact, no malfunction exists and the condition is normal.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(03-04 Chevrolet Suburban, Tahoe) and (03-04 GMC Denali, Denali XL, Yukon, Yukon XL) and (03-04 Cadillac Escalade and Escalade EXT)