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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:S48B Multifunction Switch - Overhead Console
  3. Test for less than 10 Ω between the test points:Ground circuit terminal 5 & Ground
    • If 10 Ω or greater 
    1. Disconnect the ground connection:
    2. Test for less than 2 Ω between the test points:Ground circuit terminal 5 & Ground Connection
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  4. Ignition » On / Vehicle » In Service Mode
  5. Perform the scan tool control function:Red Indicator Command »Off

    Test for less than 1 V between the test points:Control circuit terminal 14 @Component harness & Ground

    • If 1 V or greater 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:X1@K73 Telematics Communication Interface Control Module
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1V between the test points:Control circuit terminal 14 @Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K73 Telematics Communication Interface Control Module
    • If less than 1 V 
  6. Perform the scan tool control function:»Red Indicator Command On

    Test for greater than 8 V between the test points:Control circuit terminal 14 @Component harness & Ground

    • If 8 V or less 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:X1@K73 Telematics Communication Interface Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 14 @Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
    4. Ignition/Vehicle » Off
    5. Disconnect the electrical connector:X1@K73 Telematics Communication Interface Control Module
    6. Test for less than 2 between the test points:Control circuit terminal 14 @Component harness & Terminal 2 @Control module harness
      • If 2 or greater » Repair the open/high resistance in the circuit.
      • If less than 2 » Replace the component:K73 Telematics Communication Interface Control Module
    • If greater than 8 V 
  7. Test or replace the component:S48B Multifunction Switch - Overhead Console
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