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Reverse light relay - 2009 Proton Savvy 1.2

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My reverse lights and my brake lights will not work with the anti theft light on in the dash


These lights are all computer controlled ! Several modules involved DIM - dash integrated module , RIM - rear integrated module .They share information on serial data communication network . Class 2 an or GMLAN !
The rear fuse block supplies battery positive voltage through the REVERSE LAMP fuse to the coil and switch terminals of the reverse lamp relay. The DIM sends a power mode message to the RIM indicating that the ignition is in the ON position. When the driver of an automatic transmission equipped vehicle places the gear selector in the REVERSE position, the powertrain control module (PCM) sends a class 2 message to the RIM. The message indicates that the gear selector lever is in the REVERSE position. When the driver places a manual transmission equipped vehicle in reverse the reverse gear position switch mounted on the transmission closes. This provides a ground for the reverse gear position switch signal line, informing the RIM that the transmission is in reverse. For both automatic and manual transmission vehicles the RIM then grounds the control circuit of the reverse lamp relay . This energizes the reverse lamp relay, closing the switch side contacts and providing battery positive voltage to the backup lamp bulbs. The backup lamps are permanently grounded at G402. With both power and ground the backup lamp bulbs illuminate. Once the driver moves the shift lever out of the reverse position a message is send either by class 2 by the PCM or the reverse gear position switch opens causing the RIM to remove the ground from the reverse lamp relay control circuit. This opens the contacts in the relay turning OFF the backup lamps.
This is something best left to the dealer or a ASE certified repair shop . Need a factory or professional grade scan tool to diagnose an repair this . http://www.public.asu.edu/~pheanis/documents/VBI_CAN.pdf

Feb 20, 2016 | 2006 Cadillac CTS 3.6

1 Answer

1994 Mitsubishi pajero.Where does the reverse light feed come from.To operated reverse alarm.Inside vehicle.Have checked vehicles reverse light switch.This is operating.Either there is another switch.


It comes from the transmission range sensor. When you put the lever in reverse the sensor on the transmission relays this to the backup lights.

Oct 20, 2014 | 1994 Mitsubishi Pajero

1 Answer

Why do the reverse lights remain lit when the ignition is switched on and the suv is running. This happens in all gears. I removed the center console to look for the reverse light switch, and it seem


You may be looking in the wrong place. It is on the transmission. The switch must be pretty wimpy because it doesn't directly drive the reverse lights, but connects to a reverse light relay in the smart junction box. The relay could be stuck. Unplug the two wire connector at the transmission then turn the key to RUN and see if the reverse lights are still on. If they are on then the relay is stuck and needs to be replaced. If they are not on then the switch in the transmission is bad.

Sep 02, 2014 | 2008 Ford Escape

1 Answer

No reverse light, all fuse good. reverse Switch?


It's not that simple anymore . The transmission range sensor switch is what they have now . This range sensor informes the PCM - engine computer what gear the vehicle is in. When you put the gear selector into reverse B+ voltage from the range sensor to the PCM tells the PCM reverse has been selected , the PCM then will energize the reverse lamp relay (located in the under hood fuse/relay box) there by turning on the reverse lamps . There are two fuse's in the under hood fuse/relay box . F27 10amp. & F35 10amp.

Aug 11, 2017 | 2010 Ford Escape XLT

1 Answer

2004 Tacoma - tail lights don't work but brake lights and reverse lights do work. Bulbs look ok. fuse looks okay. Wiring looks ok. Could it be a relay or is there something else to check? Than


try cheaking the light switch its self may be faulty not normally a relay for but it shold tell you on fuse box which relay runs light ign ect

Sep 21, 2012 | 2007 Toyota Tacoma

1 Answer

Citroen Xantia fog and reversing lights not working


Check Fuse F3. It supplies 12v to the reverse switch located on the transmission. If auto transmission (4HP14) the switch will have 4 pins, 2 for reverse light, 2 for starting circuit. If manual, it has two pins. When gear is in other position, only one pin will have 12v. When gear is in R, both pins will have 12v. The 2nd pin supplies directly to the reversing light. Fog light has connectors behind the bumper. It tends to get corroded. Disconnect and clean both side of the connectors and retry. Some may get the wires snapped. Check there first. Fuse F18,F7 and F6 supplies 12v to the foglight circuit. F6 supplies to the foglight relay. Check the relay too.

Apr 05, 2012 | Citroen Xantia Cars & Trucks

1 Answer

Hi, i found a fog light in my shed, i want use it on my car for a reverce light..do i need to wire a relay??....& if so why?? thanks joe.


More than likely you will need to use a relay. Your reverse lights are rated for a particular amperage. The wiring, fuse and components are engineered for the amp draw. Adding an extra load like a high wattage fog lamp can cause the fuse to blow or damage the components/wiring to the reverse lights.

Relays work great for this type of application. They use a small amount of current to control a large amount of current. So adding a relay into the reverse light circuit will minimize the load draw on the circuit. It will then control either a fused power or ground (i prefer to wire them as ground side control so they aren't talking the brunt of the load which will make them last longer) that you run directly from the battery.

Oct 14, 2010 | 2003 Isuzu Rodeo

1 Answer

No reverse lights B2477 Reverse Lamp Relay Shorted to Ground. error Where is the reverse lamp relay located?


it's located on the side of your transmission and will have a couple of wires coming out of it

Oct 14, 2009 | 1997 Cadillac DeVille

1 Answer

When i switch the gear on reverse the reverse lights are off. either when i indicate to turn the indicators lights are just off. can you assist me please


First check the bulbs, than the fuse box, if this does not help it will be the reverse light switch (sensor)on the gearbox, and with indicators, try to put hazards and see what happens, if they work, than the relay for indicators might need to be replaced, if they don't than also the relay must be replaced, if the relay is not the problem than it will be the main column switch

Jul 17, 2009 | 1995 Mazda MX-6

2 Answers

Volvo V70 2.5 20v auto, reversing light fault


Yeah it's definitely the switch. Basically doesn't sense that the car's in reverse so won't turn the lights on. As far as where it's at...that I can't help you with. Volvo's tend to be a little odd...

Oct 21, 2008 | 1998 Volvo V70

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