Circuit/System Testing

Lane Departure Warning Switch Malfunction

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the ground circuit terminal 9 and ground.
- If 10 Ω or greater
1. 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.
- If less than 10 Ω
Ignition ON.
Verify the scan tool Lane Departure Warning Switch Status parameter is Open.
- If not Open
1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
2. Test for infinite resistance between the S48E Multifunction Switch - Center Console signal circuit terminal 7 and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance, replace the K109 Frontview Camera Module.
- If Open
Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
Verify DTC B356A 02 sets in approximately 10s.
- If DTC does not set
1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - 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 K109 Frontview Camera Module.
- If DTC sets
Test or replace the S48E Multifunction Switch - Center Console.

Lane Departure Warning Switch Indicator Malfunction

Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console, ignition ON.
Test for 9.1 - 12.6 V between the dimming control circuit terminal 8 and ground.
NOTE:
Verify interior lighting dimming is turned all the way up.
- If less than 9.1 V
1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, refer to Interior Backlighting Malfunction .
- If greater than 12.6 V
1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, refer to Interior Backlighting Malfunction .
- If between 9.1-12.6 V
Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
Test for less than 1 V between the control circuit terminal 6 and ground.
- If 1 V or greater
  Repair the short to voltage on the circuit.
- If less than 1 V
Ignition OFF.
Test for infinite resistance between the control circuit terminal 6 and ground.
- If less than infinite resistance
  Repair the short to ground on the circuit.
- If infinite resistance
Test for less than 5 Ω between the K109 Frontview Camera Module terminal 4 and S48E Multifunction Switch - Center Console circuit terminal 6.
- If greater than 5 Ω
  Repair the open/high resistance in the circuit.
- If less than 5 Ω
Test or replace the S48E Multifunction Switch - Center Console.
Verify the lane departure switch Indicator turns ON and OFF when pressing and releasing the lane departure warning switch.
- If indicator does not turn on and off
  Replace K109 Frontview Camera Module.
- If indicator turns on and off
All OK.