Circuit/System Verification

Engine running.
Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool.
- If the E18 Rear Defogger Grid does not turn ON or OFF
  Refer to Rear Window Defogger Malfunction .
- If the E18 Rear Defogger Grid turns ON and OFF
Verify the E17D Outside Rearview Mirror Glass-Driver and the E17P Outside Rearview Mirror Glass-Passenger become warm when commanding the Rear Defogger On with a scan tool.
- If both E17D Outside Rearview Mirror Glass-Driver and the E17P Outside Rearview Mirror Glass-Passenger do not become warm
  Refer to Circuit/System Testing - Both Outside Heated Mirrors Inoperative.
- If only one E17 Outside Rearview Mirror Glass does not become warm
  Refer to Circuit/System Testing - Single Outside Heated Mirror Inoperative.
- If the E17D Outside Rearview Mirror Glass-Driver and the E17P Outside Rearview Mirror Glass-Passenger become warm
All OK.