Circuit/System Testing

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: X1 @ X20 Memory Card Receptacle
Test for less than 10 ohms between the test points: Ground circuit terminal 4 & Ground
- If 10 ohms or greater
1. Test for less than 2 ohms between the test points: Ground circuit terminal 4 @ Component harness & The other end of the circuit
  - 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 less than 10 ohms
Verify a test lamp turns On between the test points: B+ circuit terminal 6 & Ground
- If the test lamp does not turn On
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for less than 2 ohms between the test points: B+ circuit terminal 6 & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If the test lamp turns On
Poor connections or damaged USB cables can cause intermittent or no operation of USB devices. Inspect connectors, terminals, and cables for damage and replace components as necessary. Ensure all USB inline connections and connections at components are fully seated and connector position retainers/locks are secure.
Connect the special tool: EL-50334-50
Connect the tool between the test points: X2 @ X20 Memory Card Receptacle & X3 @ K157 Video Processing Control Module
Ignition On
Verify the component activates: X20 Memory Card Receptacle
- If the component does not activate
1. Test or replace the component: X20 Memory Card Receptacle
2. Verify the component activates: X20 Memory Card Receptacle
  - If the component does not activate
    Test or replace the component: K157 Video Processing Control Module
  - Go to next step: If the component activates
    Go to next step: All OK.
- Go to next step: If the component activates
Test or replace the component: Coax Cable