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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSDODGE AND RAM20241500 TRXREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 150 ((VEHICLE SYSTEM INTERFACE MODULE (VSIM) MODULE - ELECTRICAL DIAGNOSTICS - 1500 CLASSIC))DTC TROUBLESHOOTINGB1815-12-REAR DRIVER DOOR AJAR - CIRCUIT SHORT TO BATTERYDIAGNOSTIC TEST

2024 Dodge and Ram 1500 TRX

Diagnostic Test

2024 Dodge and Ram 1500 TRXSECTION Diagnostic Test

WARNING: This page is about a different car, the 2023 RAM 1500 Classic. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC must be active for the results of this test to be valid.
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read VSIM DTCs and record on the repair order.
4. Cycle the ignition switch from off to on.
5. With the scan tool, read VSIM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 3
(G77) LEFT REAR DOOR AJAR SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE
1. Turn the Turn the ignition off.
2. Disconnect the VSIM C5 harness connector.
3. Disconnect the Upfitter harness connector.
4. Turn the ignition on.
5. Measure the voltage between (G77) Left Rear Door Ajar Switch Sense circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (G77) Left Rear Door Ajar Switch Sense circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Vehicle System Interface Module (VSIM) in accordance with the Service Information. Refer to MODULE, VEHICLE SYSTEM INTERFACE (VSIM), REMOVAL and MODULE, VEHICLE SYSTEM INTERFACE (VSIM), INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
INTERMITTENT WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring harness and connectors.
2. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
3. Look for the data to change or for the DTC to reset during the wiggle test.
4. Look for the data to change other than as expected or for the DTC to reset.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.