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IMMOBILIZER UNIT INSPECTION

BME091467003202

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 • Inspect related harness
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 | - | - | - | - | -

  * :
European (L.H.D. U.K.) specs. (except AJ)