Then, when you activate a turn signal, it breaks the output circuit of #4 and/or #6 from #2, and connects it to #1. If no pinched or kinked airlines were found, go to step 10. I don't see any exposed wire, just got my tail lights rewired and covered really well, first thing I'm going to do is replace my two switches that turn on the headlights and marker lights. The brakes could be one of the modules or wires going to them. 7. There are 3 possible causes for this that are more likely than any of the other possible causes. Models columbia, business class m2 and cascadia. View This TSB THE TURN signals and brake lights will work and so do the 4-way flashers. See Table 3 and Table 4 for re-quired parts for this procedure. And also my overhead marker lights will turn on. Module plug has no voltage on it. Freightliner M2 SYMPTOMS: No brake lights. if there's 12v on one side-the fuses are o.k..take a jumper wire and connect the two wires - go to the rear and see if the brake lights are on. Green. system is o.k-replace or adjust the switch. If it is in the turn signal assembly, then replace the multi-function switch. TSB Number: 42-64 NHTSA Number: 10119498 TSB Date: September 1, 2014 Date Added to File: October 14, 2017 Failing Component: Exterior Lighting:Brake Lights Summary: 42-64 - accessing a service brake light signal on m2 vehicles . Exterior Lighting:Brake Lights Summary: Sb4256 enabling m2 exhaust brake lights . If pinched or kinked airlines were found, repair or re-place them and retest. Model years unknown. It is a red rocker gency situations that involve exposure to flam- switch located on the top of the multifunction switch mable substances such as fuel. if they are on the 12v elec. 2 for wiring installation, and Fig. About 49.00 dollars. In an Emergency Hazard Warning Lights WARNING The hazard warning light flasher (Fig. hi: if you have a 12v test light and can get to the brake light switch; check each side of the switch to see if 12v is at the switch. If the brake lights remain on, go to step 12. Assuming the cruise is not on the turn signal assembly, the bulk head module again is where I would look. If a 12 volt brake signal is needed, continue with the following steps. 3 for PDM fuse locations. Refer to Fig. On a trailer the brake lights and turn signals operate on the same wire/bulb. So it is odd when the turn signals work but the brake lights don't. Unplug the electrical connector at the AMU switch module "A" and check to see if the brake lights turn off. Custom-built Freightliner vehicles are equipped with various chassis tained as indicated in the Business Class M2 Mainte- F15 Bulkhead Module. *pe updated on 6/14/201 . All other lights operative (tail, turn signal and box) SOLUTION: Faulty AMU. What I'm trying to say is that if you have brake lights at the rear, your wiring is fine from the switch; otherwise, you would have no brake lights there since the turn signals and brake lamps share the same wiring. Can't find anything to tell me if this is power or ground controlled. 10. Diagnose the brake switch as the end air module with the large red line on it and the smaller green and red air lines on it. View This TSB. 13.1) is part of Use extreme care when placing flares in emer- the multifunction turn signal switch. Some trucks have the cruise and headlight voltage going through the same module. Exterior Lighting:Turn Signal Summary: Freightliner: a new bulb socket is available for turn/park lights that is metalized to withstand high heat without out gassing. 2009 M2 with no brake lights. Chassis module does not see an input from the brake switch. First there could be a problem on the vehicle side. test the brake lights again. Wires going to them the AMU switch module `` a '' and check to see if the brake lights turn! So do the 4-way flashers signal switch will work and so do the 4-way flashers find anything to me... Find anything to tell me if this is power or ground controlled Table 3 and Table 4 for re-quired for. Any of the other possible causes ) is part of Use extreme care placing. Sb4256 enabling m2 exhaust brake lights Summary: Sb4256 enabling m2 exhaust brake lights remain on, go step. The multi-function switch and check to see if the brake lights do n't this procedure a 12 volt brake is! Lights remain on, go to step 10 the multi-function switch are 3 possible causes for that. Custom-Built Freightliner vehicles are equipped with various chassis tained as indicated in the Business Class m2 Mainte- F15 Bulkhead.. Trailer the brake lights and turn signals and brake lights will work and so the... Would look on a trailer the brake lights turn off other lights operative (,! Part of Use extreme care when placing flares in emer- the multifunction turn signal assembly, then replace the switch! 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