Security Indicator Light Circuit

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: Security Indicator Light Circuit

Security Indicator Light Circuit

DESCRIPTION

When the transponder key is registered, the transponder key ECU indicates the key registration condition by lighting up, blinking or turning off the security indicator.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY INDICATOR LIGHT)
(a) Select the Active Test, use Techstream to generate a command, and then check that the security indicator light operation is normal.

Immobiliser:





OK:
Security indicator light turns ON / OFF.
OK -- INSPECT TRANSPONDER KEY ECU (OUTPUT)
NG -- Continue to next step.
2. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - SECURITY INDICATOR LIGHT)





(a) Disconnect the E46 ECU connector.
(b) Disconnect the E22*1 or E23*2 light connector.
(c) Measure the resistance of the wire harness side connectors.
HINT: *1: for Manual air conditioning system
*2: for Automatic air conditioning system

Standard resistance:
for Manual Air Conditioning System
for Automatic Air Conditioning System










NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. INSPECT TRANSPONDER KEY ECU (OUTPUT)





(a) Remove the transponder key ECU with its connectors still connected.
(b) Measure the voltage of the ECU.
Standard voltage:






NG -- REPLACE TRANSPONDER KEY ECU
OK -- REPLACE CLOCK SUB-ASSEMBLY (for MANUAL AIR CONDITIONING SYSTEM), HEATER CONTROL PANEL (for AUTOMATIC AIR CONDITIONING SYSTEM)