Circuit/System Testing

Windshield Wiper Motor Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood. 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 38 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. Connect the X2 harness connector at the X50A Fuse Block-Underhood and disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
4. Verify the M75 Windshield Wiper Motor low wiping speed is not activated.
   • If the M75 Windshield Wiper Motor low wiping speed is activated 
   1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
   2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 16 X4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the X50A Fuse Block-Underhood.
   • Go to next step: If the M75 Windshield Wiper Motor low wiping speed is not activated 
5. Connect a 3 A fused jumper wire between the control circuit terminal 16 and B+.
6. Verify the M75 Windshield Wiper Motor low wiping speed activates.
   • If the M75 Windshield Wiper Motor low wiping speed does not activate 
   1. Ignition OFF, remove the jumper wire, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
   2. Test for infinite resistance between the 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 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 X50A Fuse Block-Underhood.
   • Go to next step: If the M75 Windshield Wiper Motor low wiping speed activates 
7. Replace the K9 Body Control Module.

Windshield Wiper Speed Control Malfunction

1. Ignition OFF, disconnect the X4 and X5 harness connectors at the K9 Body Control Module, ignition ON.
2. Connect a 3 A fused jumper wire between the K9 Body Control Module control circuit terminal 16 X4 and B+.
3. Verify the M75 Windshield Wiper Motor high wiping speed is not activated.
   • If the M75 Windshield Wiper Motor high wiping speed is activated 
   1. Ignition OFF, disconnect the X2 harness connector at the X50A Fuse Block-Underhood.
   2. Test for infinite resistance between the K9 Body Control Module control circuit terminal 24 X5 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the X50A Fuse Block-Underhood.
   • Go to next step: If the M75 Windshield Wiper Motor high wiping speed is not activated 
4. Connect a 3 A fused jumper wire between the K9 Body Control Module control circuit terminal 24 X5 and ground and a 3 A fused jumper wire between the control circuit terminal 16 X4 and B+.
5. Verify the M75 Windshield Wiper Motor high wiping speed activates.
   • If the M75 Windshield Wiper Motor high wiping speed does not activate 
   1. Ignition OFF, remove the jumper wires, disconnect the X2 harness connector at the X50A Fuse Block-Underhood, ignition ON.
   2. Test for less than 1 V between the K9 Body Control Module control circuit terminal 24 X5 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 control 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 X50A Fuse Block-Underhood.
   • Go to next step: If the M75 Windshield Wiper Motor high wiping speed activates 
6. Replace the K9 Body Control Module.