Question about 1999 Cadillac DeVille
HOW TO "ENTER" DIAGNOSTIC MODE OBDII
To enter diagnostic mode, proceed as follows:
1. Turn ignition "ON." Engine can be either OFF or RUNNING.
For cars equipped with the Digital Instrument Panel Display (Digital IPC):
2. Simultaneously press the "OFF and "WARMER" (red) buttons on climate control center (CCC) until all display segments (IPC and CCP) are illuminated
For cars equipped with the Analog Instrument Panel Display (Analog IPC):
3. Simultaneously press on the Climate Control Panel (CCP) the "OFF" and "PASS WARMER" (up arrow) buttons.
After the segment display test, the driver message center displays all set DTC, current and history, in the following order:
1. PCM DTC
2. IPC DTC
3. ACM DTC
4. SDM DTC
5. TCS DTC
6. PZM DTC
7. IRC DTC
8. RFA DTC
9. CCP DTC
10. MSM DTC
11. MMM DTC
12. PHN DTC
The RSS, CCP, MSM, MMM and PHN DTC appear only on vehicles equipped with these options. Press the FAN DOWN button in order to bypass the DTC display.
On the OBD II cars, the prefixes you'll see are: "IP" for the IPC instrument panel; "AC" for air conditioning module; "TC" for traction control; "RS" for the road suspension system; "SD" for the air bags; "PZ" for the body control module; "CC" for the cell phone; "RF" for the integrated radio system.
HOW TO "EXIT" DIAGNOSTIC MODE
To exit the diagnostic mode anytime during the test, depress the "ECON" or "DEFOG" button, or turn the ignition switch "OFF." .
You don't need a scan tool for these cars,as it is all built in.
Go to the following website for a list of trouble codes.
Add a comment to your post if you require any further assistance.
Hope this helps.
Posted on Oct 11, 2009
U need qa scan tool for that. most scan tools will also define the trouble code.
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
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