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I through terminal 2 of the rear window defogger switch
I to smart entrance control unit terminal 14.
Terminal 37 of the smart entrance control unit then supplies ground to the rear window defogger relay termi-
nal 2.
With power and ground supplied, the rear window defogger relay is energized.
Power is supplied
I through terminals 5 and 7 of the rear window defogger relay
I to the rear window defogger.
The rear window defogger has an independent ground.
With power and ground supplied, the rear window defogger filaments heat and defog the rear window.
When the system is activated, the rear window defogger indicator illuminates in the rear window defogger
switch.
Power is supplied
I to terminal 3 of the rear window defogger switch
I from terminal 7 of the rear window defogger relay.
Terminal 4 of the rear window defogger switch is grounded through body grounds M4, M66 and M147.
GI
MA
EM
LC
EC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
REAR WINDOW DEFOGGER
System Description (Cont’d)
EL-175
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