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This document provides the circuit description, wiring diagram, and inspection procedure for the power source circuit of the navigation system gateway ECU in a 2005 Toyota Highlander. The circuit supplies power from the battery to the gateway ECU. The inspection procedure involves measuring resistance of ignition, constant power, and ground circuits to check for opens, and measuring voltage levels to check for proper power supply under ignition switch positions of always on, accessory, and ignition on.

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56 views2 pages

Cinavi 1

This document provides the circuit description, wiring diagram, and inspection procedure for the power source circuit of the navigation system gateway ECU in a 2005 Toyota Highlander. The circuit supplies power from the battery to the gateway ECU. The inspection procedure involves measuring resistance of ignition, constant power, and ground circuits to check for opens, and measuring voltage levels to check for proper power supply under ignition switch positions of always on, accessory, and ignition on.

Uploaded by

jaydstar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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05-1834

DIAGNOSTICS - NAVIGATION SYSTEM 05ISY-02

POWER SOURCE CIRCUIT (GATEWAY ECU)

CIRCUIT DESCRIPTION
This circuit provides power to the gateway ECU.
WIRING DIAGRAM

Center J/B Gateway ECU


Instrument Panel J/B
7 IG1 10 10 1 2
G GR B
1C 1K 3A 3I G5 IG

2 RAD No.2 6 8 1 9
L W SB
1C 1J 3A 3D G5 ACC
9 8 8
LG G5 BATT
3F 3F

Passenger Side J/B


11 11 6 12
LG V V V
IL2 4D 4H IK3
I15
IGNITION SW
Instrument Panel J/B
ACC
3 6 AM1 1
W
1C 1A
4 2 2 1
IG1 AM1
F7
FL Block
ALT
W B
1 2
Engine Room J/B
1 D.C.C DOME 3
W
2I 2A
3

Center J/B
5 7
3G W-B
G5 CG
13 6 14
W-B W-B
3F 3G G5 GND
FL MAIN

Battery
IB

2005 HIGHLANDER REPAIR MANUAL (RM1144U) I39187

Author: Date: 2024


05-1835
DIAGNOSTICS - NAVIGATION SYSTEM

INSPECTION PROCEDURE
1 INSPECT GATEWAY ECU(BATT, ACC, IG, GND ,CG)

(a) Disconnect the gateway ECU connector G5.


(b) Measure the resistance according to the value(s) in the
table below.
G5 Standard:
Tester connection Condition Specified condition
IG GND - Body ground Always Below 1 Ω
CG
CG - Body ground Always Below 1 Ω
BATT
(c) Measure the voltage according to the value(s) in the table
GND
ACC I40180 below.
Standard:
Tester connection Condition Specified condition
BATT - GND or CG Always 10 to 14 V
ACC - GND or CG Ignition SW ACC 10 to 14 V
IG - GND or CG Ignition SW ON 10 to 14 V

NG REPAIR OR REPLACE HARNESS OR


CONNECTOR

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART


(SEE PAGE 05-1791 )

2005 HIGHLANDER REPAIR MANUAL (RM1144U)

Author: Date: 2025

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