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05-1863
DIAGNOSTICS - THEFT DETERRENT SYSTEM
05B9Z-01
TERMINALS OF ECU
1. CHECK INSTRUMENT PANEL J/B ASSY (MULTIPLEX NETWORK BODY ECU)
Vehicle Rear Side Vehicle Front Side
1K
B6 B7 B9 B8
1L
1C
1A 1P
Multiplex Network
Body ECU
1K
B6 B7
1L
1C
B9 B8
1A 1P
B67998
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2046
05-1864
DIAGNOSTICS - THEFT DETERRENT SYSTEM
(a) Disconnect the B6, B7 and B9 ECU connectors.
(b) Disconnect the 1A, 1C, 1L and 1K J/B connectors.
(c) Check the voltage and resistance between each terminal of the wire harness side connectors and body
ground.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
IG (1A-1) -
W - Body ground Constant 10 to 14 V
Body ground
ACC (1A-1) -
W - Body ground Constant 10 to 14 V
Body ground
BECU (1C-24) -
W-L - Body ground Constant 10 to 14 V
Body ground
ALTB (1C-30) -
B - Body ground Constant 10 to 14 V
Body ground
KSW (B6-21) - 10 k or higher
L-B - Body ground No key in ignition key cylinder Key inserted
Body ground Below 1
HCTY (B8-10) - 10 k or higher
R-W - Body ground Engine hood CLOSED OPEN
Body ground Below 1
DCTY (B9-14) - 10 k or higher
R-Y - Body ground Driver side door CLOSED OPEN
Body ground Below 1
PCTY (B7-23) - 10 k or higher
R-Y - Body ground Passenger side door CLOSED OPEN
Body ground Below 1
RCTY (B9-16) - 10 k or higher
R-W - Body ground Rear door RH CLOSED OPEN
Body ground Below 1
LCTY (1P-19) - 10 k or higher
GR - Body ground Rear door LH CLOSED OPEN
Body ground Below 1
BCTY (B7-25) - 10 k or higher
G-W - Body ground Back door CLOSED OPEN
Body ground Below 1
GND1 (1L-16) -
W-B - Body ground Constant Below 1
Body ground
GND2 (1K-17) -
W-B - Body ground Constant Below 1
Body ground
If the result is not as specified, there may be a malfunction on the wire harness side.
(d) Reconnect the B6, B7 and B9 ECU connectors.
(e) Reconnect the 1A, 1C, 1L and 1K J/B connectors.
(f) Check the voltage between each terminal of the connectors and the body ground.
Standard:
Symbols (Terminal No.) Wiring Color Condition Specified Condition
Security indicator lights up
IND (B6-24) -
B - Body ground (It lights up only for 30 sec. in alarm sounding state 3 to 6 V
Body ground
It flashes when immobiliser system is operating)
SH (B8-1) - Security horn is sounding
GR - Body ground Pulse generation 0 V
Body ground (Theft deterrent system is in alarm sounding state)
HAZ (B6-2) -
G-O - Body ground Answer-back OFF Answer-back ON Pulse generation
Body ground
If the result is not as specified, the J/B assy (body ECU) may have a malfunction.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2047
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