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 |
|---|---|
| XJ6 | Left Side Of Trunk, Behind Trim Panel |
SECURITY ELECTRONIC CONTROL MODULE (ECM) PIN VOLTAGE ASSIGNMENTS
| Terminal No. Circuit (Wire Color) | Active | Inactive | |
|---|---|---|---|
| LS43 Connector | |||
| 1 - Trunk Switch (Red/Yellow) | Ground (Trunk Open) | 5 Volts (Trunk Closed) | |
| 2 - Hood Switch (Blue/White) | Ground (Hood Open) | 5 Volts (Hood Closed) | |
| 3 - Driver's Door Switch (Purple/Red) | Ground (Door Open) | 5 Volts (Door Closed) | |
| 4 - Passenger's Door Switch (Purple) | Ground (Door Open) | 5 Volts (Door Closed) | |
| 5 - Valet Switch (Yellow/White) | Ground (Switch Off) | 5 Volts (Switch On) | |
| 6-7 - Not Used | |||
| Ground (Unlocked) | 8 - Driver/Passenger Door Lock Switch (Yellow/Orange) | 5 Volts (Locked) | |
| 9 - Ignition Switched Power | 12 Volts (Ignition On) | Open Circuit (Ignition Off) | |
| 10 - Not Used | |||
| 11 - Intrusion Sensor (Yellow/Red) | 5 Volts (System Armed) | 5 Volts (System Unarmed) | |
| 12-18 - Not Used | |||
| Ground | 19 - Alarm Antenna Shield (Pink) | Ground | |
| 20 - Alarm Antenna (Pink) | Transmitter Signal | N/A | |
| LS44 Connector | |||
| 1 - Intrusion Sensor (Yellow/Brown) | Pulses To Ground (Lock Cycle) | Pulses To 12 Volts (Unlock Cycle) | |
| 2 - Lock/Unlock Signal To ECM (Red/Orange) | Pulse To Ground (Lock/Unlock Cycle) | 5 Volts | |
| 3 - Not Used | |||
| 4 - Turn Signal Flash (Light Green/Purple) | Pulsed Signal | 5 Volts | |
| 5 - Not Used | |||
| Ground (On) | 6 - Headlight Flash (Purple/Orange) | 12 Volts (Off) | |
| 7 - Trunk Release (Purple/White) | Ground (Release) | 12 Volts | |
| 8 - Sound Horn (Green/Blue) | Ground (Horn On) | 12 Volts (Horn Off) | |
| 9 - Security LED | 3.6 Volts (LED On) | 0.8 Volt (LED Off) | |
| 10-11 - Not Used | |||
| 12 - Side Light Flash (Blue/Black) | Pulse To Ground (Flash) | 12 Volts | |
| LS45 Connector | |||
| 1 - Battery Power (Brown/Blue) | 12 Volts | 12 Volts | |
| 2 - Power Ground (Black) | Ground | Ground | |
| 3 - Logic Ground (Black/Pink) | Ground | Ground | |
| 4 - Communications Data Link (Pink) | JDS | N/A | |
| 5 - Communications Data Link (Orange) | JDS | N/A | |
| 6 - Security Sounder (White/Orange) | Pulsed Voltage | Open Circuit | |
| 7 - Security Sounder (White/Black) | Pulsed Voltage | Open Circuit | |
| 8 - Shock Sensor (Gray) | Pulse To Ground - Jaguar Diagnostic System (JDS). | 5 Volts | |
| 9-15 - Not Used | |||
| 16 - Shock Sensor (Red) | Pulse To Ground | 5 Volts | |
| - Check pin voltage between specified terminal and known good ground. Use wiring diagram and illustration to aid in identifying terminals location. See appropriate wiring diagram in WIRING DIAGRAMS. See Fig 1 through Fig 3 . | |||