DTC B2494 - Liftgate Handle Switch Malfunction
Diagnostic InstructionsDTC Descriptor

Note: This procedure may also diagnose malfunctions that are not detected by a DTC.

DTC B2494 02

Liftgate Handle Switch Circuit—Short to Ground

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Signal

B2494 02

1

1

—

Low Reference

—

1

—

—

  1. Liftgate Handle Switch=Disabled
Circuit/System Description

For an overview of the component/system, refer to:Liftgate Description and Operation

Circuit

Description

Signal

The control module input circuit has an internal resistance connected to 12 V.

Low Reference

Grounded through the control module.

Component

Description

S46B Liftgate Unlatch Switch

When the switch is activated, the signal circuit to the control module is grounded.

K39 Liftgate Control Module

The control module K39 controls the liftgate motor function depending on inputs from a variety of sensors, switches and serial data information from other control modules.

Conditions for Running the DTC

Ignition » On / Vehicle » In Service Mode

Conditions for Setting the DTC

Signal circuit=Short to Ground—For greater than 60 s

Actions Taken When the DTC Sets

S46B Liftgate Unlatch Switch=Disabled

Conditions for Clearing the DTC
  • A current DTC will clear when the diagnostic runs and passes.
  • A history DTC will clear after 50 consecutive malfunction-free ignition cycles.
Reference Information

Schematic Reference

Liftgate Schematics

Connector End View Reference

Master Electrical Component List

Electrical Information ReferenceScan Tool Reference

Control Module References

Circuit/System Verification
  1. Ignition » On / Vehicle » In Service Mode
  2. Verify the scan tool parameter:Liftgate Handle Switch=Inactive
    • If not the specified state

      Refer to: Circuit/System Testing

    • If the specified state
  3. Operate the component:S46B Liftgate Unlatch Switch»Pressed

    Verify the scan tool parameter:Liftgate Handle Switch=Active

    • If not the specified state

      Refer to: Circuit/System Testing

    • If the specified state
  4. All OK.
Circuit/System Testing

    Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector:S46B Liftgate Unlatch Switch
  3. Test for less than 10 Ω between the test points:Low Reference circuit terminal 2&Ground
    • If 10 Ω or greater
    1. Disconnect the electrical connector:K39 Liftgate Control Module
    2. Test for less than 2 Ω between the test points:Low Reference circuit terminal 2@Component harness&Terminal 16 X1@Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K39 Liftgate Control Module
    • If less than 10 Ω
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter:Liftgate Handle Switch=Inactive
    • If not the specified state
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K39 Liftgate Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 1@Component harness&Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component:K39 Liftgate Control Module
    • If the specified state
  6. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 1&Low Reference circuit terminal 2
  7. Verify the scan tool parameter:Liftgate Handle Switch=Active
    • If not the specified state
    1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
    2. Disconnect the electrical connector:K39 Liftgate Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 1@Component harness&Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points:Signal circuit terminal 1@Component harness&Terminal 14 X1@Control module harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component:K39 Liftgate Control Module
    • If the specified state
  8. Test or replace the component:S46B Liftgate Unlatch Switch
Component Testing
  1. Ignition/Vehicle » Off
  2. Disconnect the electrical connector:S46B Liftgate Unlatch Switch
  3. Test for infinite resistance between the test points:Signal terminal 1&Low Reference terminal 2—SwitchNot Pressed
    • If less than infinite resistance

      Replace the component:S46B Liftgate Unlatch Switch

    • If infinite resistance
  4. Test for less than 3 Ω between the test points:Signal terminal 1&Low Reference terminal 2—Switch»Pressed
    • If 3 Ω or greater

      Replace the component:S46B Liftgate Unlatch Switch

    • If less than 3 Ω
  5. All OK.
Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification