Chart 8 - Defogger "ON" Continuously

CHART 8 DEFOGGER "ON" CONTINUOUSLY

ECC SYSTEM CHECK MUST BE PERFORMED FIRST

CIRCUIT DESCRIPTION
The programmer provides a ground for the defogger relay when it receives a command from the Electronic Climate Control Panel (ECCP) via the data line. The BCM times the operation initially for 10 minutes, then commands the programmer to deactivate the relay ground. Additional requests for rear defogger are for 5 minute intervals, thereafter until a new ignition cycle occurs.

Test Description: Numbers below refer to circled numbers on the diagnostic chart.
1. This step checks to see if CKT 291 is grounded.
2. This step checks for a short to voltage on CKT 293.
3. This step checks to see if the programmer 15 grounding CKT 291.