Dimmer Signal Circuit

NAVIGATION: NAVIGATION SYSTEM (for HDD): Dimmer Signal Circuit

Dimmer Signal Circuit

DESCRIPTION

The display and navigation assembly dims the display and panel switches by receiving a TAIL cancel signal from the main body ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION ASSEMBLY - MAIN BODY ECU)




(a) Disconnect the L59 display connector.
(b) Disconnect the L12 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK MAIN BODY ECU (ACAN VOLTAGE)




(a) Reconnect the L12 ECU connector.
(b) Power switch is ON (IG).
(c) Turn the light control switch to the TAIL or HEAD position.
(d) Set the instrument panel light control to less than the maximum (to activate the dimmer function that works when the light control switch is in the TAIL position).
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- GO TO LIGHTING SYSTEM
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE