Heated Windshield Inspection Procedure

Initial Checks:

• Make sure vehicle battery is sufficiently charged and fusing for heated windshield is correct and present.
• Check that all electrical connections at screen terminals (four of) are in position and connected.

If initial checks are completed and the fault is still present, proceed with the following root cause investigation/troubleshooting steps:

1. Consult the appropriate service information and select the appropriate removal and installation procedure to remove vehicle interior trim.
2. Remove the relevant interior 'A' pillar trim. Both 'A' pillar trims will need to be removed if the issue is reported for the whole screen.
3. Vehicle diagnostics (harness, power supply, fusing faults).
   1. Working on one side of the vehicle at a time, locate the screen terminals (two per heater bank) and disconnect the power feed (upper connection) and ground connection (lower connection).
   2. Connect a volt meter to the separated vehicle harness connection points.
   3. Turn the vehicle on and make sure that the 'Heated Windshield' function has been activated.
   4. Record the voltage observed. If the display reads between 9V - 16V, the vehicle harness, power and fusing are all functioning correctly.
   5. If the fault has been recorded for the whole full screen, repeat the above checks for the opposite heater bank.
4. Component diagnostics (wiggle wire faults)
   1. Working on one side of the vehicle at a time, locate the screen terminals (two per heater bank) and disconnect the power feed (upper connection) and ground connection (lower connection).
   2. Connect multi-meter probes to the upper and lower screen terminals.
   3. Check for continuity and resistance across each heater bank.
   4. The multi-meter should show continuity across the heating bank and a resistance reading should be displayed.

Heated Rear Window Inspection Procedure 

Initial checks:

• Make sure vehicle battery is sufficiently charged and fusing for heated windshield is correct and present.
• Check that all electrical connections at screen terminals (two of) are in position and connected.

If initial checks are completed and the fault is still present, proceed with the following root cause investigation/troubleshooting steps:

1. Consult the appropriate service information and select the appropriate removal and installation procedure to remove vehicle interior trim.
2. Remove the interior trim from both sides of the vehicle.
3. Vehicle diagnostics (harness, power supply, fusing faults).
   1. Locate the screen terminals (two of) and disconnect the power feed and ground connection.
   2. Connect a volt meter to the separated vehicle harness connection points.
   3. Turn the vehicle on and make sure that the 'Heated Rear Screen' function has been activated.
   4. Record the voltage observed. If the display reads between 9V - 16V, the vehicle harness, power and fusing are all functioning correctly.
4. Component diagnostics (silver print faults)
   1. Locate the screen terminals (two of) and disconnect the power feed and ground connection.
   2. Connect multi-meter probes to the screen terminals.
   3. Check for continuity and resistance across the heater bank.
   4. The multi-meter should show continuity across the heating bank and a resistance reading should be displayed.

Heated Windshield Permissible Failures 

Permissible Failures 

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

There can be up to 3 defective elements in each heater bank at any one time:

1. The element closest to the A pillar
2. The element closest to the windshield centre-line
3. AND a single element in the main body of the heater bank

NON Permissible Failures 

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

No more than three elements per heater bank can be defective at any one time.

No more than one defective elements per heater bank (not including A pillar or windshield centre-line elements).

No two adjacent elements in one heater bank can be defective.