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Home >> Jeep >> 2010 >> Wrangler Islander, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> (Cabin Compartment Node (CCN) - Electrical Diagnostics) >> DTC Troubleshooting >> DTC P0928: BTSI Control Circuit >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs.

      Is the DTC active?

      Yes 

      • Go to step  2

      No 

      • The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  2. BTSI SOLENOID 
    Fig 1: Measuring Voltage Of BTSI Unlock Signal Circuit Using 12-Volt Test Light Connected To Ground
    GC0132055Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Shift Lever Assembly harness connector.
    3. Turn the ignition on.
    4. Press the brake pedal.
    5. Using a 12-volt test light connected to ground, measure the voltage of the (K321) BTSI Unlock Signal circuit.

      Does the test light illuminate brightly when the brake pedal is depressed?

      Yes 

      • Go to step  3

      No 

      • Go to step  4
  3. BTSI SOLENOID GROUND CIRCUITS 
    Fig 2: Measuring Resistance Between Ground & Ground Circuit Using Test Light Connected To B+
    GC0132056Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Using a test light connected to B+. Measure the resistance between ground and the Ground circuit in the Shift Lever Assembly harness connector.

      Does the test light illuminate brightly for each circuit?

      Yes 

      No 

  4. (K321) BTSI UNLOCK SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 3: Measuring Voltage Of BTSI Unlock Signal Circuit Using 12-Volt Test Light Connected To Ground
    GC0132057Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Cluster C3 harness connector.
    3. Turn the ignition on.
    4. Using a 12-volt test light connected to ground, measure the voltage of the (K321) BTSI Unlock Signal circuit.

      Does the test light illuminate brightly?

      Yes 

      No 

      • Go to step  5
  5. (K321) BTSI UNLOCK SIGNAL SHORTED TO GROUND 
    Fig 4: Measuring Resistance Between Ground & BTSI Unlock Signal Circuit Using Test Light Connected To B+
    GC0132058Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Using a test light connected to B+, measure the resistance between ground and the (K321) BTSI Unlock Signal circuit.

      Does the test light illuminate brightly?

      Yes 

      No 

      • Go to step  6
  6. (K321) BTSI UNLOCK SIGNAL CIRCUIT OPEN 
    Fig 5: Measuring Resistance Of BTSI Unlock Signal Circuit
    GC0132059Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (K321) BTSI Unlock Signal circuit.

      Is the resistance above 10K Ohms?

      Yes 

      No