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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • 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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 8 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S48C Multifunction Switch 1 - Instrument Panel.
    • Go to next step: If the test lamp illuminates 
  5. Verify the scan tool Vehicle Direction Warning Switch Status parameter is Off.
    • If not Off 
    1. Ignition OFF, disconnect the harness connector at the K124 Active Safety Control Module.
    2. Test for infinite resistance between the S48C Multifunction Switch - Instrument Panel signal circuit terminal 4 and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the K109 Frontview Camera Module.
    • Go to next step: If Off 
  6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground circuit terminal 7.
  7. Verify within 10 s the scan tool Vehicle Direction Warning Switch Status parameter is On.
    • If not On 
    1. Ignition OFF, disconnect harness connector at the K124 Active Safety Control Module. Ignition ON.
    2. Test for less than 1 V between the S48C Multifunction Switch - Instrument Panel signal circuit terminal 4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V.
    3. Test for less than 2 Ω in the signal circuit end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the K124 Active Safety Control Module.
    • Go to next step: If On 
  8. Test or replace the S48C Multifunction Switch - Instrument Panel.
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