IMMOBILIZER UNIT INSPECTION


BME091467003W02

1. Measure the voltage at the immobilizer unit terminals as indicated below.

2. Disconnect the immobilizer unit connector before inspecting for continuity at terminal C.

• If not as specified, inspect the parts listed under "Action."
• If the parts and wiring harnesses are okay but the system still does not work properly, replace the immobilizer unit.

Terminal Voltage Table (Reference)

Terminal

Signal

Connected to

Test condition

Voltage (V)/continuity

Action

A
Communication with PCM
PCM
Ignition switch at ON position
B+
• Inspect PCM
• Inspect related harness
Ignition switch at LOCK position
Below 1.0
B
-
-
-
-
-
C
GND
GND
Under any condition: inspect for continuity to ground
Yes
• Inspect GND
D
Power supply to coil
Coil
Key removed from key cylinder
Below 1.0
• Inspect coil
• Inspect related harness
Key inserted into key cylinder
Cannot be measured
E
-
-
-
-
-
F
Key ID number input
Coil
Key removed from key cylinder
Below 1.0
• Inspect coil
• Inspect related harness
Key inserted into key cylinder
Cannot be measured
H
Key reminder switch input
Key reminder switch
Key removed from key cylinder
Below 1.0
• Inspect key reminder switch
• Inspect related harness
Key inserted into key cylinder
B+
J
Back-up power supply
Battery
Under any condition
B+
• Inspect ROOM 15 A fuse
• Inspect related harness
K
Starter relay output
Starter relay
Ignition switch at START position
Below 1.0
• Inspect starter relay
• Inspect related harness
Ignition switch at LOCK position
0
L
Power supply
Ignition switch
Ignition switch at ON position
B+
• Inspect ENGINE 10 A fuse
• Inspect related harness
Ignition switch at OFF position
Below 1.0
M
Security light output
Security light
Security light neither illuminates nor blinks
B+
• Inspect security light
• Inspect related harness
N
-
-
-
-
-