Pinpoint Test Purpose

To verify the presence of DTC U0553 and identify the correct Service Information for diagnosing the DTC concern.

1. BM1: CHECK PSCM DTC 
   • Ignition ON, engine running.

     Carry out the PSCM self-test.

   • Is DTC U0553:xx currently present and active in the PSCM? 

   Yes	No
   Go to  BM2.	If the PSCM does NOT list DTC U0533 Invalid Data Received from the RLCM-B, DISCONTINUE this test and REFER to the DTC Chart for diagnostic direction.

2. BM2: CHECK THE VEHICLE BATTERY AND CHARGING SYSTEM VOLTAGE 
   • Ignition ON, engine OFF.
   • Refer to the Charging System General Information article and carry out Pinpoint Test A: Battery Condition Test (battery state of charge).
   • Did the battery pass the condition test (battery state of charge)  ?

   Yes	No
   Go to  BM3..	INSTALL a new 12-volt battery. REFER to the Battery, Mounting and Cables article. Go to  BM3.

3. BM3: RECHECK THE PSCM DTC 
   • Ignition ON, engine OFF.
   • Clear the PSCM DTCs.
   • Ignition OFF.
   • Ignition ON, engine running.

     Carry out the PSCM self-test.

   • Is DTC U0553:xx currently present and active in the PSCM  ?

   Yes	No
   RETRIEVE and RECORD all RLCM-B or TRM DTCs. REFER to Diagnosis and Testing in the Exterior Lighting 1 of 2 and/or Exterior Lighting 2 of 2 article and DIAGNOSE the TRM.	The concern is not present at this time and may have been set due to a low battery state of charge. The test is complete, no further action is required.