Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 343
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP–13
MP
OK:
Neither DTC B1214 nor DTC B1215 is output.
NOTICE:
Disconnect the connector in the operational
sequence, and start the next step after the connector
is reconnected.
OK
NG
(a) Check for a short-circuit in B+ or body ground.
Main Body ECU
Back Door ECU
MPX2
MPX2
B137555E01
REPLACE BACK DOOR ECU
2
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BACK DOOR ECU)
Main Body ECU
Back Door ECU
MPX2
MPX2
B137554E01
MP–14
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP
(b) Disconnect the S2 back door ECU connector and E6
main body ECU connector.
(1) Measure the voltage between the terminals of the
S2 back door ECU or E6 main body ECU connector
and body ground.
Standard voltage
(2) Check the resistance.
Standard resistance
(c) Reconnect the back door ECU connector and main body
ECU connector.
NG
OK
23
22
26
18
10
25
13 14
16 17
19 20
11 12
15
24
27
30
29
28
21
1
2
3
4
5
6
7
8
9
1
8
7
6
5
4
3
2
Wire Harness Side:
Back Door ECU
Main Body ECU
S2
E6
MPX2
MPX2
Front View
Front View
B137571E03
Tester Connection
Condition
Specified Condition
E6-23 (MPX2) or S2-1 (MPX2) - Body
ground
Ignition switch ON
Below 1 V
Tester Connection
Specified Condition
E6-23 (MPX2) or S2-1 (MPX2) - Body ground
10 k
Ω or higher
REPAIR OR REPLACE WIRE HARNESS
BETWEEN MAIN BODY ECU AND BACK
DOOR ECU
REPLACE MAIN BODY ECU
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP–15
MP
DESCRIPTION
DTC B1287 is output when communication between the back door ECU and the main body ECU stops for
more than 10 seconds.
WIRING DIAGRAM
DTC
B1287
Back Door ECU Communication Stop
DTC No.
DTC Detection Condition
Trouble Area
B1287
Back door ECU communication stops
•
Back door ECU
•
Wire harness
POWER
Back Door ECU
Main Body ECU
J/B
ALT
Short
Pin
ECU-B
Battery
BDR
BECU
GND
MPX2
MPX2
B137552E01
MP–16
MULTIPLEX COMMUNICATION – MULTIPLEX COMMUNICATION SYSTEM
MP
INSPECTION PROCEDURE
(a) Disconnect the E6 main body ECU and S2 back door
ECU connectors.
(b) Check the resistance.
Standard resistance
(c) Reconnect the main body ECU and back door ECU
connectors.
NG
OK
(a) Disconnect the S2 back door ECU connector.
(b) Measure the voltage between the terminals of the S2
back door ECU connector and body ground.
Standard voltage
(c) Reconnect the ECU connector.
NG
1
CHECK COMMUNICATION LINE
23
22
26
18
10
25
13 14
16 17
19 20
11 12
15
24
27
30
29
28
21
1
2
3
4
5
6
7
8
9
1
8
7
6
5
4
3
2
Wire Harness Side:
Back Door ECU
Main Body ECU
S2
E6
MPX2
MPX2
Front View
Front View
B137571E03
Tester Connection
Specified Condition
E6-23 (MPX2) - S2-1 (MPX2)
Below 1
Ω
REPAIR OR REPLACE HARNESS OR
CONNECTOR
2
CHECK BACK DOOR ECU (POWER SOURCE)
1
8
7
6
5
4
3
2
Wire Harness Side:
Back Door ECU
BECU
S2
Front View
B137572E01
Tester Connection
Specified Condition
S2-5 (BECU) - Body ground
11 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR
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