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Home >> Cadillac >> 2019 >> XT5 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Sunroof System) >> Diagnostic Information and Procedures >> DTC B369B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Cadillac XT5. However, it is still accessible from the selected car via links, so may be relevant.

Sunshade Switch Malfunction

    NOTE:

    Because of the accessibility of the sunshade switch, perform the component testing before beginning the Circuit/System Testing.

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A98 Front Overhead Console Assembly. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the M69 Sunroof Motor.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.5 - 5.5 V between the 5 V reference circuit terminal 10 and ground.
    • If less than 4.5 V 
    1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M69 Sunroof Motor.
    • If greater than 5.5 V 
    1. Ignition OFF, disconnect the harness connector at the M69 Sunroof Motor, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the M69 Sunroof Motor.
    • Go to next step: If between 4.5 - 5.5 V 
  5. Test or replace the A98 Front Overhead Console Assembly.

Power Sunshade Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M69 Sunroof Motor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 4 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 B+ circuit terminal 1 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 B+ 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 not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M69 Sunroof Motor.
    • Go to next step: If the test lamp illuminates 
    5. NOTE:

    Sunroof must be completely closed and latched prior to performing test

  5. Verify the test lamp turns ON and OFF when pressing the sunshade OPEN switch on the A98 Front Overhead Console Assembly.
    • If the test lamp remains OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the M69 Sunroof Motor.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuits end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M69 Sunroof Motor.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the M69 Sunroof Motor, ignition ON.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the M69 Sunroof Motor.
    • Go to next step: If the test lamp turns ON and Off 
  6. Replace the M69 Sunroof Motor.
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