IM(diag)-19
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
IMMOBILIZER (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK BODY INTEGRATED UNIT POWER
SUPPLY CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from body inte-
grated unit.
3) Measure the voltage between the body inte-
grated unit connector terminal and chassis
ground.
Connector & terminal
(B280) No. 6 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step
2.
Check the harness
for open or short
circuit between
body integrated
unit and fuse.
2
CHECK BODY INTEGRATED UNIT POWER
SUPPLY CIRCUIT.
1) Turn the ignition switch to ON.
2) Measure the voltage between the body inte-
grated unit connector terminal and chassis
ground.
Connector & terminal
(B280) No. 1 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step
3.
Check the harness
for open or short
circuit between the
body integrated
unit and ignition
switch.
3
CHECK BODY INTEGRATED UNIT GROUND
CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the body
integrated unit connector terminal and chassis
ground.
Connector & terminal
(i84) No. 28 — Chassis ground:
(B280) No. 17 — Chassis ground:
(B281) No. 20 — Chassis ground:
(B279) No. 27 — Chassis ground:
Is the resistance less than 10
Ω?
Go to step
4.
Repair the open
circuit of the body
integrated unit
ground circuit.
4
CHECK GROUND CIRCUIT FOR ECM.
Measure the resistance between the ECM
ground terminal and engine ground.
Is the resistance less than 10
Ω?
Go to step
5.
Repair the ECM
ground circuit.
5
CHECK HARNESS BETWEEN BODY INTE-
GRATED UNIT AND ECM.
1) Disconnect the connector from the ECM
and body integrated unit.
2) Measure the resistance between body inte-
grated unit connector terminal and ECM con-
nector terminal.
Connector & terminal
(B280) No. 4 — (B135) No. 25:
(B280) No. 15 — (B135) No. 24:
Is the resistance less than 10
Ω?
Go to step
6.
Repair the open
circuit of the har-
ness between the
body integrated
unit and ECM.
6
CHECK COMMUNICATION CIRCUIT HAR-
NESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between the body inte-
grated unit connector terminal and chassis
ground.
Connector & terminal
(B280) No. 4 (+) — Chassis ground (–):
(B280) No. 15 (+) — Chassis ground (–):
Is the voltage 6 V or more?
Repair the harness
between body inte-
grated unit and
ECM.
Go to step
7.
7
CHECK COMMUNICATION CIRCUIT HAR-
NESS.
Measure the voltage between ECM connector
terminal and engine ground.
Connector & terminal
(B135) No. 24 (+) — Engine ground (–):
(B135) No. 25 (+) — Engine ground (–):
Is the voltage 6 V or more?
Repair the harness
between body inte-
grated unit and
ECM.
Go to step
8.