DTC 55

DTC 55: Initialization of TPMS Control Unit is Not Completed





1. Check the indicated location to make sure the wheel is a TPMS type with the tire pressure sensor properly mounted in it.
Is the pressure sensor mounted properly?
YES-Go to step 4.
NO-Go to step 2.
2. Install a known-good TPMS wheel.
3. To memorize the sensor ID, drive the vehicle above 15 mph (24 km/h) for 40 continuous seconds, or memorize the ID with the HDS,
4. Turn the ignition switch ON (II).





5. With the HDS, check the indicated tire for the pressure sensor signal. If no response is shown on the HDS, turn the ignition switch OFF, rotate the tire quarter turn, then turn the ignition switch ON (II), and try again.
Is there at least one response in one full turn of the tire?
YES-The system is OK at this time. Clear the DTC.
NO-Go to step 6.
6. Install a wheel with a known-good tire pressure sensor on the vehicle. Memorize the sensor ID and check that wheel location again for a pressure sensor signal (repeat the procedure in step 5).
Is there a response this time?
YES-Replace the tire pressure sensor on the customer's wheel.
NO-Go to step 7.





7. Turn the ignition switch OFF, then disconnect TPMS control unit connectors A (14P) and B (20P) and the appropriate initiator connector (3P).
8. Turn the ignition switch ON (II).





9. Check for continuity between the appropriate terminal in TPMS control unit connector A (14P) and the corresponding terminal in the initiator connector (3P) (see table).
Is there continuity?
YES-Go to step 10.
NO-Repair the open in the appropriate wire between the TPMS control unit and the initiator





10. Check for continuity between the appropriate terminal in TPMS control unit connector B (20P) and the corresponding terminal in the initiator connector (3P) (see table).
Is there continuity?
YES-Go to step 11.
NO-Repair the open in the appropriate wire between the TPMS control unit and the initiator.





11. Check for continuity between the appropriate terminal in TPMS control unit connector B (20P) and the corresponding terminal in the initiator connector (3P) (see table).
Is there continuity?
YES-Go to step 12.
NO-Repair the open in the appropriate wire between the TPMS control unit and the initiator.





12. Check for continuity between the appropriate terminal in TPMS control unit connector B (20P) and body ground (see table).
Is there continuity?
YES-Repair the short body ground in the appropriate wire between the TPMS control unit and the initiator.
NO-Go to step 13.
13. Turn the ignition switch ON (II).





14. Check for power between the appropriate terminal in TPMS control unit connector B (20P) and body ground (see table).
Is there battery voltage?
YES-Repair the short to power in the appropriate wire between the TPMS control unit and the initiator.
NO-Check for loose terminals and poor connections at the TPMS control unit. If necessary, substitute a known-good TPMS control unit and recheck.