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Battery voltage from the CHMSL/BCK-UP fuse located in the rear fuse block is supplied to the body control module (BCM) for backup lamp operation. When the gear selector is placed in to the REVERSE position, the powertrain control module (PCM) sends a GMLAN serial data message to the BCM indicating that the gear selector is in the reverse position. The BCM then applies battery voltage to the backup lamp supply voltage circuit illuminating the left and right backup lamps. Ground for both backup lamps is provided at G403.
The 10A BACKUP fuse in the fuse block - underhood supplies ignition positive voltage to the park/neutral position (PNP) switch of the automatic transmission. When the transmission is placed in reverse, the switch supplies voltage to the back up lamps and the inside rearview mirror. The back up lamps receive ground at G401 and G403.
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.
It could be something simple like the lamp has gone in your reversing light, have you tried changing the lamp or testing the connections with a volt meter? if there is no voltage when the engine is on and in reverse (you may need someone to help) then you sould check the visible connections and cabling. Last but not least you can check the continuity of the fuse for your lights in your fuse board (you can find its location in users manual) hope this has helped a little.
When a driver engages the reverse gear he or she automatically switches the reverse light on by triggering the switch on and if the lights are not coming on it means that a number of reasons are to blame. I will start with fuses and the wiring around the switch. Thank you for using fixya!
sorry to say , get a voltmeter and go through the wiring starting at the fuse box and follow on from there, that includes the ground circuits, its time consuming but revesing polarity can cause untold damage
Trailer Tow reversing relay ( non serviceable ) and the Trailer tow parking lamp relay are both fed from Fuse #10 ( coil on reversing relay is fed from reverse lamps & coil on parking lamp relay is fed from the parking lamps ).
Trailer Tow battery charge relay is fed from Fuse #106 ( coil is fed by fuse #13, hot in start / run position from key ).
Right Stop / Turn is fed from Fuse #36 ( powered from MFS circuit for truck stop/turn ) Left Stop / Turn is fed from Fuse #42 ( powered from MFS circuit for truck stop/turn )
1.Disconnect the negative (-) battery
terminal.2.Remove the nuts holding the rear combination
lamp.3.Disconnect the connector and remove the lamp
assembly.
It is located in the trunk, behind the furthest rearward panel. (right inboard of the light housing).
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