Cargo lamps w Reverse and fog-lights w parking lights wiring help

[xtremespeed2102]

On 12/15/2020 at 2:59 PM, kodiakdenali said:

Replied to the other thread, saw it in the popular topics list and thought I could help, didn't even notice it was in the wrong forum. copying here:

 

 

Disclaimer:  This is based off the upfitter manual schematics and technical data, It would be best to look up and confirm and verify this information before you make modifications!

To activate the Fog lights with the parking lights you can use a diode to jumper the relay controls:

fog lights relay controls is X5 (brown? connector) pin 10, BRN/WHT wire

Parking lights relay control is X5 (brown? connector) pin 22, BLU wire

both are ground triggers for relays so to activate fog lights with parking lights:

diode jumper Parking Lights Relay Control BCM X5, pin 22, BLU wire (GND signal) to Fog Lights Relay Control BCM X5, pin 10, BRN/WHT wire (GND signal), diode stripe goes towards Parking Lights, BLUE wire

refer to the upfitter manual, pages (these are from the 2020 sierra book, pages may vary some with other years or for the silverado manual)

7-255 for BCM connector X5 pinout

2-24 for fog lights control schematics

2-28 for parking lights schematics, as an example. the parking lights are actually on a number of different schematics. , 2-31, 2-32. 2-33 etc.

 

for cargo lights on with reverse lights,

backup lights relay control is X5 pin 26 BLU/BRN wire, note, this is a +12V relay control wire, not ground like usual. This relay is labeled the trailer backup lights relay in the schematic. according to the schematic, it is responsible for sending the reverse lights command to the tail light assemblies (for sierra LED tail lights, others may be different)

cargo lights (standing lamp relay control) is BCM X6 (pink) connector, pin 26, BRN/WHT and this also is a +12V signal.

so for cargo lights on with reverse lights

diode jumper backup lights relay control, BCM X5, pin 26 BLU/BRN  (+12V signal)  to cargo lights relay control BCM X6, pin 10, BRN/WHT (+12V signal), the diode strip goes towards the cargo lights, BRN/WHT wire

note that because of the two different circuits for the cargo lights, this should activate the cargo light on the back of the cab and the "hitch" light on the back of the tailgate, but will not turn on the interior bed lights.

references:

7-256 BCM X6 pinout (cargo lights)

7-255 for BCM X5 pinout (reverse lights)

2-31, 2-32 for backup lights schematics

2-38 for cargo lights schematics

 

in both cases the only extra load we are adding to the source signal is a relay control, very low current draw. any standard diode will be fine.

 

If anyone sees any errors, please let me know!

 

On 12/15/2020 at 2:59 PM, kodiakdenali said:

Replied to the other thread, saw it in the popular topics list and thought I could help, didn't even notice it was in the wrong forum. copying here:

 

 

Disclaimer:  This is based off the upfitter manual schematics and technical data, It would be best to look up and confirm and verify this information before you make modifications!

To activate the Fog lights with the parking lights you can use a diode to jumper the relay controls:

fog lights relay controls is X5 (brown? connector) pin 10, BRN/WHT wire

Parking lights relay control is X5 (brown? connector) pin 22, BLU wire

both are ground triggers for relays so to activate fog lights with parking lights:

diode jumper Parking Lights Relay Control BCM X5, pin 22, BLU wire (GND signal) to Fog Lights Relay Control BCM X5, pin 10, BRN/WHT wire (GND signal), diode stripe goes towards Parking Lights, BLUE wire

refer to the upfitter manual, pages (these are from the 2020 sierra book, pages may vary some with other years or for the silverado manual)

7-255 for BCM connector X5 pinout

2-24 for fog lights control schematics

2-28 for parking lights schematics, as an example. the parking lights are actually on a number of different schematics. , 2-31, 2-32. 2-33 etc.

 

for cargo lights on with reverse lights,

backup lights relay control is X5 pin 26 BLU/BRN wire, note, this is a +12V relay control wire, not ground like usual. This relay is labeled the trailer backup lights relay in the schematic. according to the schematic, it is responsible for sending the reverse lights command to the tail light assemblies (for sierra LED tail lights, others may be different)

cargo lights (standing lamp relay control) is BCM X6 (pink) connector, pin 26, BRN/WHT and this also is a +12V signal.

so for cargo lights on with reverse lights

diode jumper backup lights relay control, BCM X5, pin 26 BLU/BRN  (+12V signal)  to cargo lights relay control BCM X6, pin 10, BRN/WHT (+12V signal), the diode strip goes towards the cargo lights, BRN/WHT wire

note that because of the two different circuits for the cargo lights, this should activate the cargo light on the back of the cab and the "hitch" light on the back of the tailgate, but will not turn on the interior bed lights.

references:

7-256 BCM X6 pinout (cargo lights)

7-255 for BCM X5 pinout (reverse lights)

2-31, 2-32 for backup lights schematics

2-38 for cargo lights schematics

 

in both cases the only extra load we are adding to the source signal is a relay control, very low current draw. any standard diode will be fine.

 

If anyone sees any errors, please let me know!

Hello,  

 

Sorry for bringing up an old post.  If i wanted to add a second button in the bed of thy truck to turn the cargo lights on, where can I pull 12v from? 

 

Thanks! 

[GETGONE]

The cargo lights are triggered via ground, not 12 volt positive. There is another thread here detailing what someone did. You have to run a wire to the BCM pin for the cargo light and to the switch and from the switch to ground. This is on my to-do list but haven't had time to fish and run the wire from the bed to the cab.