Antitheft System - Inspection/Diagnostics
VOLUME3
GROUP
General Information
NUMBER
010
MODEL
Amanti
DATE
May 2004
SUBJECT
Amanti Immobilizer Diagnostics
This bulletin provides information related to diagnostic and inspection procedures for Immobilizer error codes when checking the engine PCM on 2004 Amanti vehicles.
Immobilizer error code when checking the PCM (Powertrain Control Module)
^ P1609: Immobilizer Communication Malfunction.
If a P1609 code is displayed when checking the PCM with the Hi Scan Pro, check the Body Control Module for the specific cause of the Immobilizer malfunction. From the System Menu select Body Control Module, from the sub-menu select Body Control Module again, then select Diagnostic Trouble Codes. The malfunction will be displayed as shown below.
Immobilizer error codes when checking the BCM (Body Control Module)
^ ECU - BCM Communication Line Data Error
^ IMMO Power Short To Ground
^ IMMO Power Short To Battery
^ IMMO Output Signal Open/Short (Ground)
^ IMMO Output Signal Short To Battery
^ IMMO Input Signal Short To Ground
^ IMMO Input Signal Open/Short (Battery)
^ IMMO Antenna Coil Malfunction
If no specific malfunction is listed in the BCM, go to Immobilizer from the system menu and check Transponder TP Status for a valid key.
See the this bulletin for Immobilizer error diagnostics.
Note:
For the following diagnostics, use ETM sections B-1a, I-2a (key set switch), and U. Immobilizer communications at "key in" are very fast, use a digital voltmeter - set to mm-max to catch readings.
Remove driver side knee bolster to access Connector I-22 at ignition switch (see photo).
^ ECU - BCM Communication Line Data Error
Failure Condition:
Communication data error between PCM and BCM at ignition ON.
Troubleshooting:
Check the communication line between the PCM and BCM for an open circuit or short to ground from BCM terminal D7 to PCM terminal C15.
^ Immobilizer Power Short To Ground
Failure Condition:
Immobilizer power circuit from BCM is shorted to ground.
Troubleshooting:
Backprobe pin 8 at Connector I-22 with a voltmeter set to mm-max, check voltage and insert key into ignition switch. Voltage should switch from 0V to 9-10V and back to 0V in less than one second. If not okay check circuit from I-22 pin 8 to BCM Connector D-19 for open or short to ground.
^ Immobilizer Power Short To Battery
Failure Condition:
Immobilizer power circuit from BCM is shorted to battery power.
Troubleshooting:
Backprobe pin 8 at Connector I-22 with a voltmeter set to mm-max, check voltage and insert key into ignition switch. Voltage should switch from 0V to 9-10V and back to 0V in less than one second. If not okay check circuit from I-22 pin 8 to BCM D-19 for open or short to battery power
^ Immobilizer Output Signal Open/Short (Ground)
Failure Condition:
Immobilizer output circuit has a poor connection or is shorted to ground.
Troubleshooting:
Backprobe pin 3 at Connector I-22 with a voltmeter set to mm-max, check voltage and insert key into ignition switch. Voltage should switch from 0V to approximately 2V and back to OV in less than one second. If not okay check circuit from I-22 pin 3 to BCM D-9 for open or short to ground.
^ Immobilizer Output Signal Short To Battery
Failure Condition:
Immobilizer output circuit is shorted to battery power.
Troubleshooting:
Backprobe pin 3 at Connector I-22 with a voltmeter set to mm-max, check voltage and insert key into ignition switch. Voltage should switch from OV to approximately 2V and back to 0V in less than one second. If not okay check circuit from I-22 pin 3 to BCM D-9 for a short to battery power
^ Immobilizer Input Signal Short To Ground
Failure Condition:
Immobilizer input signal is shorted to ground.
Troubleshooting:
Backprobe pin 2 at connector I-22 with a voltmeter set to mm-max, check voltage and insert key into ignition switch. Voltage should stay at 5V and not change more than .3V while inserting key. If not okay check circuit from I-22 pin 2 to BCM D-8 for a short to ground.
^ Immobilizer Input Signal Open/Short (Battery)
Failure Condition:
Immobilizer Input signal is open or shorted to battery power.
Troubleshooting:
Backprobe pin 2 at connector I-22 with a voltmeter set to mm-max, check voltage and insert key into ignition switch. Voltage should stay at 5V and not change more than .3V while inserting key. If not okay check circuit from I-22 pin 2 to BCM D-8 for an open circuit or short to battery power.
^ Immobilizer Antenna Coil Malfunction
Failure Condition:
Immobilizer antenna coil is open or shorted. Replace antenna and coil on the ignition key set.
^ Key In Ignition Switch Test
Troubleshooting:
Backprobe pin 4 at connector I-22 with a voltmeter. With the key out of the ignition pin 4 should read 4.5-5.0V, with key inserted reading should drop to 0V. If not okay check I-22 pin 1 for continuity to ground.