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Home >> Chrysler >> 2008 >> Pacifica Touring, FWD >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition Control - Electrical Diagnostics >> Ignition Control-Electrical Diagnostics >> DTC Troubleshooting >> B2109-Ignition Switch Sense Input Circuit High >> Diagnostic Test
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Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 

    Turn the ignition on.

    With the scan tool, record and erase DTCs.

    Wait 30 seconds.

    With the scan tool, read DTCs.

    Does the scan tool display this DTC as active? 

    Yes 

    1. Go To  2.

    No 

    1. 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 chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
    2. Perform BODY VER TEST - VER 1 .
  2. IGNITION SWITCH 
    Fig 1: Ignition Switch Harness Connector - Pins 1, 2 3 And 5
    GC0048751Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Ignition Switch harness connector.

    Connect a jumper wire between the (F20) Fused Ignition Switch Output (Run/Start) circuit and the (A106) Fused B+ circuit.

    Connect a jumper wire between the (G20) Ignition Switch Sense circuit and the (G900) Ignition Switch Sense Return circuit.

    With the scan tool, erase and read DTCs.

    Does the scan tool display DTC: B2108-IGNITION SWITCH SENSE INPUT CIRCUIT LOW as active? 

    Yes 

    1. Replace the Ignition Switch in accordance with the service information.
    2. Perform BODY VER TEST - VER 1 .

    No 

    1. Go To  3.
  3. (G20) IGNITION SWITCH SENSE CIRCUIT OPEN 
    Fig 2: Measuring The Resistance Of The Ignition Switch Sense Circuit
    GC0048752Courtesy of CHRYSLER LLC

    Remove the jumper wire.

    Disconnect the BCM C5 harness connector.

    Measure the resistance of the (G20) Ignition Switch Sense circuit.

    Is the resistance above 10K ohms? 

    Yes 

    1. Repair the (G20) Ignition Switch Sense circuit for an open.
    2. Perform BODY VER TEST - VER 1 .

    No 

    1. Go To  4.
  4. (G900) IGNITION SWITCH SENSE RETURN CIRCUIT OPEN 
    Fig 3: Measuring The Resistance Of The Ignition Switch Sense Return Circuit
    GC0048753Courtesy of CHRYSLER LLC

    Disconnect the BCM C4 harness connector.

    Measure the resistance of the (G900) Ignition Switch Sense Return circuit.

    Is the resistance above 10K ohms? 

    Yes 

    1. Repair the (G900) Ignition Switch Sense Return circuit for an open.
    2. Perform BODY VER TEST - VER 1 .

    No 

    1. Replace the BCM in accordance with the service information.
    2. Perform BODY VER TEST - VER 1 .
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