Troubleshooting the Immobilizer System
TROUBLESHOOTING THE IMMOBILIZER SYSTEMEngine Does Not Start
1. Insert a programmed ignition key into the ignition switch, and turn the switch to START (III) Does the engine crank?
Yes - Go to step 2.
No - The immobilizer system is OK. Refer to the Engine Electrical section of the appropriate service manual to troubleshoot the starting system.
2. Cycle the ignition switch to LOCK (0), and then back to ON (II). Make sure that when you turn the ignition switch to ON (II), the immobilizer indicator blinks once and then goes off. Turn the ignition switch to LOCK (0); the indicator should not come on
Does the immobilizer indicator function properly?
Yes - The immobilizer system is OK. Refer to the Fuel and Emissions section of the appropriate service manual for additional troubleshooting.
No - Go to step 3.
3. Use the HDS to check for DTCs. Are there any DTCS?
Yes - Use the appropriate service manual to troubleshoot the DTCs you found.
No - Go to step 4.
4. Using the HDS, go to the Immobilizer Menu, and select System Check.
5. Read the message on the screen.
^ If the message says Immobilizer system is normal, look for other possible causes of the no start condition.
^ If the message says Immobilizer system is not normal, do this:
- Fix the problem using the displayed info, or
- Refer to the Body Electrical section of the appropriate service manual to troubleshoot the immobilizer system, or
- Online, enter keyword IMMOBI, and select Immobilizer System Symptom Troubleshooting Information from the list.
Engine Intermittently Does Not Start
1. Ask the customer if the immobilizer indicator flashed 10 times when the ignition switch was turned to LOCK (0) after the engine would not start. Does the immobilizer indicator flash 10 times when the ignition switch is turned to LOCK (0)?
Yes - Go to step 2.
No - The immobilizer system may be OK. Refer to the Fuel and Emissions section of the appropriate service manual for additional troubleshooting. If the customer is not sure how the indicator worked, go to step 2.
2. Use the HDS to check for DTCs. Are there any DTCs?
Yes - Use the appropriate service manual to troubleshoot the DTCs you found.
No - Go to step 3.
3. Using the HDS, go to the Immobilizer Menu, and select Status Log. A list of status log numbers and occurrences is displayed.
4. Check the status log count. You'll see the list, the status log codes, and the number of occurrences in two columns.
^ If all the status codes show 0 occurrences, the immobilizer system is OK. Continue with normal troubleshooting.
^ If a status shows one or more occurrences, highlight that column, and an explanation of the code and a list of possible failure appears. Do this
- Fix the problem using the displayed info, or
- Refer to the Body Electrical section of the appropriate service manual to troubleshoot the immobilizer system, or
- Online, enter keyword IMMOBI, and select Immobilizer Symptom Troubleshooting Information from the list.