TM-9-2320-334-13&P LHST Operator, Field and Parts Manual M1147A1 Trailer Download
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TM 9-2330-334-13&P  ANTI-LOCK BRAKE SYSTEM (ABS) DIAGNOSTIC  LIGHT DOES NOT OPERATE-Continued 0031 00  BRAKE SYSTEM TROUBLESHOOTING - Continued  Table 1. Anti-Lock Brake System (ABS) Diagnostic Light Does Not Operate - Continued.  0031 00-3 Change 1  INDICATION/CONDITION DECISION (NO/YES) PROCEDURAL STEPS  2. Is continuity present  between terminal lug P1041  (-) (white wire) and a known  good ground?  No. Go to (Indication/Condition  4).  1. Position towing vehicle  master power switch to off.  Yes. Replace ABS diagnostic  light (WP 0074 00).  2. Set multimeter to ohms.  3. Disconnect terminal lug  P1041 from ABS diagnostic  light.  4. Connect positive (+) probe  of multimeter to terminal lug  P1041 (-) (white wire).  5. Connect negative (-) probe  of multimeter to a known  good ground and note  reading on multimeter.