Circuit/System Testing

Test 1

1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: B174W Frontview Camera - Windshield
3. Test for infinite resistance between the test points: Signal circuit terminal 10 & Ground
   • If less than infinite resistance 
   1. Disconnect the electrical connector: S70L Steering Wheel Controls Switch - Left
   2. Test for infinite resistance between the test points: Signal circuit terminal 10 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Test or replace the component: S70L Steering Wheel Controls Switch - Left
   • Go to next step: If infinite resistance 
4. Press and hold the switch: Forward Collision Alert Switch

   Test for 1.2 k to 1.4 kohms between the test points: Signal circuit terminal 10 & Ground

   • If not between 1.2 k and 1.5 kohms 
   1. Disconnect the electrical connector: S70L Steering Wheel Controls Switch - Left
   2. Ignition - On/Vehicle - In Service Mode
   3. Test for less than 1 V between the test points: Signal circuit terminal 10 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
   4. Ignition/Vehicle - Off
   5. Test for less than 2 ohms between the test points: Signal circuit terminal 2 @ Component harness & Signal circuit terminal 10 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S70L Steering Wheel Controls Switch - Left
   • Go to next step: If between 1.2 k and 1.4 kohms 
5. Replace the component: B174W Frontview Camera - Windshield

Test 2

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: P43 Collision Alert Indicators
3. Verify a test lamp turns On between the test points: Ground circuit terminal 4 & B+
   • If the test lamp does not turn On 
   1. Test for less than 2 ohms between the test points: Ground circuit terminal 4 & Ground terminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
   • Go to next step: If the test lamp turns On 
4. Ignition - On/Vehicle - In Service Mode
5. Verify a test lamp turns On between the test points: Ignition circuit terminal 1 & Ground
   • If the test lamp does not turn On and the circuit fuse is OK 
   1. Ignition/Vehicle - Off & Remove - Test lamp
   2. Test for less than 2 ohms between the test points: Ignition circuit terminal 1 @ P43 Collision Alert Indicators & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
   • If the test lamp does not turn On and the circuit fuse is open 
   1. Ignition/Vehicle - Off & Remove - Test lamp
   2. Test for infinite resistance between the test points: Ignition circuit terminal 1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Test or replace the component: P43 Collision Alert Indicators
   • Go to next step: If the test lamp turns On 
6. Ignition/Vehicle - Off
7. Disconnect the electrical connector: P16 Instrument Cluster
8. Ignition - On/Vehicle - In Service Mode
9. Test for less than 1 V between the test points:
   • Control circuit terminal 30 @ P16 Instrument Cluster & Ground
   • Control circuit terminal 12 @ P16 Instrument Cluster & Ground
   • If 1 V or greater 

     Repair the short to voltage on the circuit.

   • Go to next step: If less than 1 V 
10. Ignition/Vehicle - Off
11. Test for infinite resistance between the test points:
    • Control circuit terminal 30 @ P16 Instrument Cluster & Ground
    • Control circuit terminal 12 @ P16 Instrument Cluster & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
12. Test for less than 2 ohms between the test points:
    • Control circuit terminal 30 @ P16 Instrument Cluster & Control circuit terminal 3 @ P43 Collision Alert Indicators
    • Control circuit terminal 12 @ P16 Instrument Cluster & Control circuit terminal 2 @ P43 Collision Alert Indicators
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
13. Replace the component: P43 Collision Alert Indicators
14. Ignition - On/Vehicle - In Service Mode
15. Perform the appropriate scan tool control function: All Indicators

    Verify the component activates: Collision Alert - Indicators

    • If the component does not work as specified 

      Replace the component: P16 Instrument Cluster

    • Go to next step: If the component works as specified 
16. All OK.