Circuit/System Testing

• If 10 ohm; or greater 

1. Disconnect Ground Connection
2. Test for less than 2 ohm; between the test points:Ground circuit terminal 85 & Ground Connection
   • If 2 ohm; or greater » Repair the open/high resistance in the circuit.
   • If less than 2 ohm » Repair the open/high resistance in the ground connection.

• If less than 10 ohm; 

Verify the test lamp turns On and Off.

• If the test lamp is always Off 

1. Ignition/Vehicle » Off & Remove » Test lamp
2. Disconnect the electrical connector: X2 K33 HVAC Control Module
3. Test for infinite resistance between the test points:Control circuit terminal 86 @Relay Socket &Ground
   • If less than infinite resistance » Repair the short to ground on the circuit.
   • If infinite resistance
4. Test for less than 2 ohm; between the test points:Control circuit terminal 86 @Relay Socket&Terminal 19x2@Control module harness
   • If 2 ohm; or greater » Repair the open/high resistance in the circuit.
   • If less than 2 ohm; » Replace the component:K33 HVAC Control Module

• If the test lamp is always On 

1. Ignition/Vehicle » Off & Remove » Test lamp
2. Disconnect the electrical connector:K33 HVAC Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:Control circuit terminal 86 @Relay Socket&Ground
   • If 1 V or greater » Repair the short to voltage on the circuit.
   • If less than 1 V » Replace the component:K33 HVAC Control Module

• If the test lamp turns On and Off 

• 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 ohm; between the test points:B+ circuit terminal 30@Relay Socket&Output terminal@Fuse
   • If 2 ohm; or greater » Repair the open/high resistance in the circuit.
   • If less than 2 ohm; » 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:B+ circuit terminal 30&Ground
   • If less than infinite resistance » Repair the short to ground on the circuit.
   • If infinite resistance
3. Disconnect the electrical connector: X1&X2 E18 Rear Defogger Grid
4. Test for infinite resistance between the test points:Control circuit terminal 87 @Relay Socket&Ground
   • If less than infinite resistance » Repair the short to ground on the circuit.
   • If infinite resistance
5. Replace the component:Fuse
6. Install the component:KR5 Rear Defogger Relay
7. Connect a test lamp between the test points:Control circuit terminal 1 X1 & Ground circuit terminal 1 X2
8. Ignition » On / Vehicle » In Service Mode
9. Perform the scan tool control function:Rear Defogger On and Off

   Verify the test lamp turns On and Off.

   • If the test lamp does not turn On and Off » Test or replace the component:KR5 Rear Defogger Relay
   • If the test lamp turns On and Off » Test or replace the component:E18 Rear Defogger Grid

• If the test lamp turns On 

Verify the component does not turn On and Off when connecting and disconnecting the jumper wire:E18 Rear Defogger Grid

• If the component turns On and Off 

  Test or replace the component:KR5 Rear Defogger Relay

• If the component does not turn On and Off 

• If 10 ohm; or greater 

1. Disconnect Ground Connection
2. Test for less than 2 ohm; between the test points:Ground circuit terminal 1 X2 @Component harness&Ground Connection
   • If 2 ohm; or greater » Repair the open/high resistance in the circuit.
   • If less than 2 ohm; » Repair the open/high resistance in the ground connection.

• If less than 10 ohm; 

Verify the test lamp turns On and Off.

• If the test lamp is always Off 

  Repair the open/high resistance in the circuit:Control circuit

• If the test lamp is always On 

  Repair the short to voltage on the circuit:Control circuit

• If the test lamp turns On and Off