Circuit/System Testing

B1516 08

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: B18 Battery Current Sensor
3. Test for less than 30 ohms between the test points: Low Reference circuit terminal B & Ground
   • If 30 ohms or greater 
   1. Disconnect the electrical connector: X5 @ K9 Body Control Module
   2. Test for less than 2 ohms between the test points: Low Reference circuit terminal B @ Component harness & Terminal 6 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component: K9 Body Control Module
   • Go to next step: If less than 30 ohms 
4. Ignition - On / Vehicle - In Service Mode
5. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal A & Low Reference circuit terminal B
   • If less than 4.8 V 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: X4 @ K9 Body Control Module
   3. Test for infinite resistance between the test points: 5 V Reference circuit terminal A @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   4. Test for less than 2 ohms between the test points: 5 V Reference circuit terminal A @ Component harness & Terminal 21 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
   • If greater than 5.2 V 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: X4 @ K9 Body Control Module
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: 5 V Reference circuit terminal A @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K9 Body Control Module
   • Go to next step: If between 4.8 and 5.2 V 
6. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal C @ Component harness & Ground
   • If less than 4.8 V 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: X4 @ K9 Body Control Module
   3. Test for infinite resistance between the test points: Signal circuit terminal C @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
   4. Test for less than 2 ohms between the test points: Signal circuit terminal C @ Component harness & Terminal 18 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
   • If greater than 5.2 V 
   1. Ignition/Vehicle - Off
   2. Disconnect the electrical connector: X4 @ K9 Body Control Module
   3. Ignition - On / Vehicle - In Service Mode
   4. Test for less than 1 V between the test points: Signal circuit terminal C @ Component harnessGround
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K9 Body Control Module
   • Go to next step: If between 4.8 and 5.2 V 
7. Test or replace the component: B18 Battery Current Sensor

B1516 66

1. Verify the following component is properly installed: B18 Battery Current Sensor - The sensor is installed securely around the negative battery cable, with the tape tab pointing away from the negative terminal on the C1 Battery.
   • If the component is not properly installed 

     Install the component in the proper position: B18 Battery Current Sensor

   • Go to next step: If the component is properly installed 
2. Test or replace the component: B18 Battery Current Sensor