Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSDODGE AND RAM2023PROMASTER 3500 CUTAWAYREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADAS(LEFT BLIND SPOT SENSOR MODULE (BSM) (LBSS) - ELECTRICAL DIAGNOSTICS)DTC TROUBLESHOOTINGU1752-86-RIGHT BLIND SPOT SENSOR (RBSS) - SIGNAL INVALIDDIAGNOSTIC TEST

2023 Dodge and Ram ProMaster 3500 Cutaway

Diagnostic Test

2023 Dodge and Ram ProMaster 3500 CutawaySECTION Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read LBSS DTCs and record on the repair order.
2. With the scan tool, erase DTCs.
3. Cycle the ignition from on to off, wait five seconds and then back to on.
4. With the scan tool, read LBSS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION.
CHECK THE CAN CIRCUITS FROM THE LBSS TO THE RBSS
1. Turn the ignition off.
2. Disconnect the LBSS Module harness connector and the RBSS harness connector.
3. Check the CAN circuits for opens or shorts.
  Are there any CAN circuits shorted or open?
  
  Yes
  - Repair the CAN circuits that are open or shorted.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST.
  No
  - Go To 3
CHECK RBSS AND LBSS HARNESS CONNECTORS
1. Check the LBSS and RBSS harness connectors.
  Are there any problems with the harness connectors?
  
  Yes
  - Restore the correct function of the connector.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST.
  No
  - Go To 4
CHECK THE RBSS POWER SUPPLY CIRCUITS
1. Turn the ignition off.
2. Disconnect the RBSS harness connector.
3. Check the Instrument Cluster power supply circuits with a test light.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the RBSS Power supply circuits.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST.
CHECK THE LBSS POWER SUPPLY CIRCUITS
1. Turn the ignition off.
2. Disconnect the LBSS harness connector.
3. Check the LBSS power supply circuits with a test light.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6
  No
  - Repair the LBSS Power supply circuits.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST.
CHECK THE RBSS FUNCTIONALITY
1. Check for proper operation of the RBSS.
  Does the RBSS operate correctly?
  
  Yes
  - Go To 7
  No
  - Replace and program the Right Blind Spot Sensor (RBSS) in accordance with the Service Information. Refer to SENSOR, BLIND SPOT, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST.
CHECK THE LBSS FUNCTIONALITY
1. Check for proper operation of the LBSS.
  Does the LBSS operate correctly?
  
  Yes
  - Test complete.
  No
  - Replace and program the Left Blind Spot Sensor (LBSS) in accordance with the Service Information. Refer to SENSOR, BLIND SPOT, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.