RM38N0EC _56 Audio / Visual / Telematics _111823 NAVIGATION / MULTI INFO DISPLAY _0502893 NAVIGATION SYSTEM J

NAVIGATION / MULTI INFO DISPLAY  NAVIGATION SYSTEM  Dimmer Signal Circuit  


DESCRIPTION

The main body ECU (multiplex network body ECU) sends an auto dimmer signal to the navigation receiver assembly via this circuit.

When the navigation receiver assembly receives an auto dimmer signal from the main body ECU (multiplex network body ECU), the navigation receiver assembly causes the instrument panel illumination to be dimmed.

WIRING DIAGRAM

E479728E01
0.458,2.094 2.094,2.438 1.635,0.344 10 false Main Body ECU (Multiplex Network Body ECU) 0.458,1.927 0.781,2.167 0.323,0.24 10 false E37 1.25,1.031 1.677,1.219 0.427,0.188 10 false ACAN 5.188,2.094 7.156,2.396 1.969,0.302 10 false Navigation Receiver Assembly 5.292,0.927 5.49,1.125 0.198,0.198 10 false 23 1.74,0.927 1.927,1.115 0.188,0.188 10 false 29 5.552,1.042 5.979,1.24 0.427,0.198 10 false ADIM 5.125,1.865 5.49,2.052 0.365,0.188 10 false E137

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.



PROCEDURE

1.INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
a.

Disconnect the E137 navigation receiver assembly connector.


b.
E469384C03
1.51,0.354 1.927,0.583 0.417,0.229 2.385,2.688 1.885,2.031 false 1.563,0.396 2.042,0.594 0.479,0.198 10 false E137 0.156,0.125 0.469,0.323 0.313,0.198 10 false *a 2.427,2.635 2.958,2.896 0.531,0.26 10 false ADIM
*a Front view of wire harness connector
(to Navigation Receiver Assembly)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(E137)Location & Routing

Click Connector(E137)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Navigation Receiver Assembly

E137-23 (ADIM) - Body ground Ignition switch ON
Automatic light control sensor covered by hand, and light control switch in tail or head position 		9 V or higher



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereAudio / Visual / Telematics>NAVIGATION / MULTI INFO DISPLAY>NAVIGATION SYSTEM>PROBLEM SYMPTOMS TABLE


NG

2.CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
2.CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
a.

Disconnect the E37 main body ECU (multiplex network body ECU) connector.


b.

Disconnect the E137 navigation receiver assembly connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(E37,E137)Location & Routing

Click Connector(E37)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Multiplex Network Body ECU

Click Connector(E137)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Navigation Receiver Assembly

E37-29 (ACAN) - E137-23 (ADIM) Always Below 1 Ω
E37-29 (ACAN) or E137-23 (ADIM) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR