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DI-557
DIAGNOSTICS - BACK DOOR CONTROL SYSTEM
DI57I-05
CIRCUIT INSPECTION
Power Source Circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the back door ECU.
WIRING DIAGRAM
I14 Driver Side J/B
Ignition Switch Back Door ECU
2 ECU-IG 2 11 6 6 3
B-Y Y Y Y Y
1I 1G IE2 BR1 BS1 B18 IG
2 4
2 POWER 4 L
1K 1C
W
W-R 3C 3
Center J/B
2 2
3C 2
2 L
AM1
IE1 6
12 2 L
ALT J/B BR2 1
1 1 5 1
L L
BS2 B18 POWE
MPX-B 13 2 8 8 2
L-R L-R IE1
L-R L-R L-R B18
2 IG1 BR1 BS1 ECU-B
1 2
2 3 3 26
W-B W-B W-B
Engine Room R/B BR1 BS1 B18 GND
W
Battery
BH
I23891
2002 4RUNNER (RM887U)
Author : Date : 733
DI-558
DIAGNOSTICS - BACK DOOR CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check POWER and JCB M-fuses, and MPX-B and ECU-IG fuses.
CHECK:
Check the continuity of the POWER and JCB M-fuses, and MPX-B and ECU-IG fuse.
OK:
Continuity
NG Replace failure fuse.
OK
2 Check voltage between terminals POWE/ECU-B/IG and GND of back door ECU
connector.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals IG and GND.
OK:
Voltage: 10 - 14 V
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the back door ECU connector.
CHECK:
Measure the voltage between terminals POWE/ECU-B and GND.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-556 ).
NG
2002 4RUNNER (RM887U)
Author : Date : 734
DI-559
DIAGNOSTICS - BACK DOOR CONTROL SYSTEM
3 Check harness and connector between back door ECU and body ground (See
page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween back door ECU and battery.
2002 4RUNNER (RM887U)
Author : Date : 735
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