Headlights and Rear Defogger

Electrical Load Signal Schematic:

The ECU monitors electrical loads from the headlights and rear window defogger. Problems in these systems will set code 62 in the on-board diagnostic system. Refer to the schematic diagram and test the systems with the diagnostic chart.

Wire color code identification:

L: Blue
B: Black
Y: Yellow
G: Green
R: Red
W: White
Br: Brown
Lg: Light green
Gr: Gray

Electrical Load Signal Diagnostic Chart:

ELECTRICAL LOAD SIGNAL DIAGNOSTIC CHART

ECU Connectors:

CHECK VOLTAGE AND RESISTANCE

1. With ignition "OFF," disconnect ECU connector.
2. Turn ignition "ON" and measure voltage between ECU connector terminals and ground as follows:

Connector & terminal: Voltage:
(F120)18-Ground Below 2V (defogger "OFF")
(F120)18-Ground Above 8V (defogger "ON")
(F120)20-Ground Above 8V (headlights "OFF")
(F120)20-Ground Above 8V (headlights "HI")
(F120)21-Ground Above 8V (headlights "OFF")
(F120)21-Ground Above 8V (headlights "LO")

3. With ignition "OFF," measure resistance between ECU connector and ground as follows:

Connector & terminal: Resistance:
(F119)1-Ground Below 10 Ohms
(F120)10-Ground Below 10 Ohms