Information on BCM Calibrations Available to Restore Bulb Outage Detection on Vehicles Produced By A Second Stage Manufacturer, Turn Signals Flash Fast After Factory Box Removed (Upfitter)

This bulletin is being revised to add more information about new RPO option 9U5 and Warranty Information. Please discard Corporate Bulletin Number 07-08-42-006A (Section 08 -- Body and Accessories).

The information contained in this bulletin applies to vehicles that are to be completed by a second stage manufacturer (upfitter) and may need to have the Body Control Module (BCM) rear turn signal bulb outage detection capability changed. All production vehicles will be manufactured with one of the following BCM rear turn signal bulb outage detection software options:

1. A standard production vehicle will have BCM software that checks for two bulbs functioning in each rear turn signal bulb circuit. If one or more bulbs are inoperative, the BCM will "fast flash" the Instrument Panel Cluster (IPC) turn signal indicator as required by Federal Motor Vehicle Safety Standard (FMVSS) 108 and Canada Motor Vehicle Safety Standard (CMVSS) 108.
2. Starting in 2008, certain 2500 and 3500 models can be ordered with a new option (RPO 9U5) where the BCM checks for one bulb functioning in each rear turn signal bulb circuit. If the bulb goes inoperative, the BCM will "fast flash" the Instrument Panel Cluster (IPC) turn signal indicator as required by Federal Motor Vehicle Safety Standard (FMVSS) 108 and Canada Motor Vehicle Safety Standard (CMVSS) 108.
3. A vehicle built with a pickup box delete or chassis cab option (RPO ZW9) will be produced with a BCM program that has no turn signal bulb outage detection capability (LED compatible). The IPC turn signal indicator will flash at the same rate no matter how many turn signal bulbs are inoperative.

In some cases, the upfitter may wish to change the turn signal bulb outage detection capability so that the turn signals work correctly with their upfit or to meet certain requirements. This will require contacting the Techline Customer Support Center (TCSC) (1-800-828-6860 English or 1-800-503-3222 French) to open a case and obtain a Vehicle Configuration Index (VCI) number. Advise the TCSC consultant which turn signal bulb outage detection capability is needed:

1. Factory standard production TWO bulb outage detection.
2. Optional (RPO 9U5) ONE bulb outage detection. NOTE: ONLY AVAILABLE ON CERTAIN 2008 MODEL 2500 AND 3500 VEHICLES
3. NO bulb outage detection (LED compatible).

The BCM can then be reprogrammed with the correct software.

For vehicles repaired under warranty, use: