Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. With the scan tool, read the active DTCs.
2. Erase the DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals, and repair any obvious problems.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK (W527) VSIM CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking VSIM CAN B BUS (+) Circuit For A Short To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Multi-Purpose Module (Police And Taxi Interface Module-PTIM) C2 harness connector.
3. Disconnect the Multi-Purpose Module (Police And Taxi Interface Module-PTIM) 24 way harness connector (aftermarket light/siren controller side).
4. Disconnect the scan tool from the DLC.
5. Measure the resistance between ground and the (W527) VSIM CAN B Bus (+) circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (W527) VSIM CAN B Bus (+) circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Multi-Purpose Module (Police And Taxi Interface Module-PTIM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .