Anti-Theft System: Testing
NOTE:
Unless stated otherwise in testing procedures, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate.
Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at security Electronic Control Module (ECM) determines whether it is receiving and transmitting proper input and output signals. Charts may also help determine if ECM wiring harness is shorted or open. Disconnect security ECU connector. See SECURITY ECM LOCATION table. Test security ECM connector terminals as indicated. See appropriate SECURITY ELECTRONIC CONTROL MODULE (ECM) PIN VOLTAGE ASSIGNMENTS table.
SECURITY ECM LOCATION
| Application | Location |
|---|---|
| XJS | Right Side Of Trunk, Behind Trim Panel |
NOTE:
Information for XJS 6.0L Security Electronic Control Module (ECM) pin voltage assignment chart is not available from manufacturer.
SECURITY ECM PIN VOLTAGE ASSIGNMENTS (4.0L)
| Terminal No. Circuit (Wire Color) (1) | Active | Inactive | |||
|---|---|---|---|---|---|
| ST2 Connector | |||||
| 1 - LED Warning Light (Pink/Black) | 12 Volts (LED On Steady) | Pulsed Voltage (LED Flashing) | |||
| 2 - Ignition Switched Power (White/Pink) | 12 Volts (Ignition On) | Open Circuit (Ignition Off) | |||
| 3 - Valet Switch (White/Black) | Ground (Switch On) | Open Circuit (Switch Off) | |||
| 4 - Trunk Light Switch (Black/Gray) | Ground (Trunk Open) | 12 Volts (Trunk Closed) | |||
| 5 - Siren Voltage Supply (Yellow/Gray) | 12 Volts | 12 Volts | |||
| 6 - Power Ground (Black) | Ground | Ground | |||
| 7 - Battery Power (Brown/Yellow) | 12 Volts | 12 Volts | |||
| 8 - Shock Sensor (Blue) | Pulse To Ground | 5 Volts | |||
| 9 - Passive Arming (Yellow) | Ground (Link Installed) | Open Circuit (Link Removed) | |||
| 10 - LED Drive Ground (Yellow/Black) | 0.7 Volt (Light On Steady) | Pulsed Ground (Light Flashing) | |||
| 11 - Siren Drive Voltage (Orange) | Voltage Pulse (Sound Siren) | N/A | |||
| 12 - Headlight Flash Relay (Brown/Black) | Ground (Lights On) | 12 Volts (Lights Off) | |||
| 13 - Door Open (Black/Purple) | Ground (Door Open) | 12 Volts (Door Closed) | |||
| 14 - Not Used | |||||
| ST3 Connector | |||||
| 1 - Backup Battery (Red) | 6 Volts (Full Charge) | N/A | |||
| 2 - Not Used | |||||
| 3 - Parking Light Flash (Brown/Red) | Ground (Lights On) | 12 Volts (Lights Off) | |||
| 4-9 - Not Used | |||||
| 10 - Door Unlock (Orange/Red) | Pulse To Ground (Unlock Signal) | Open Circuit | |||
| 11 - Door Lock (Orange/Blue) | Pulse To Ground (Lock) | Open Circuit | |||
| 12 - Passive Arming (Yellow) | Ground (Link Installed) | 5 Volts (Link Removed) | |||
| 13-14 - Not Used | |||||
| 15 - Horn (Purple/Black) | Ground (Horn On) | 12 Volts (Horn Off) | |||
| 16 - Starter Inhibit Relay (White/Orange) | Ground (Starter Disabled) | 12 Volts (Starter Enabled) | |||
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