TM-9-2320-366-20-1 MTV Unit Maintenance Manual M1083 Series - Volume 1 Download
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e55. BACKUP LIGHT DOES NOT ILLUMINATE (CONT) TM 9-2320-366-20-1 2-704 Change 1 TEST OPTIONS REASON FOR QUESTION KNOWN INFO 18. POSSIBLE PROBLEMS Do backup lights operate with new WTEC III relay K25 installed? WTEC III Relay K25 Replacement Test If backup lights operate with new WTEC III relay K25 installed, WTEC III relay K25 is faulty. If backup lights do not operate with new WTEC III relay K25 installed, WTEC III transmission ECU is faulty. Circuit breaker CB70 OK. Circuit breaker CB73 OK. Both turn signals illuminate. Engine starts. Transmission reverse (R) range OK. Backup light lamps OK. Backup light assembly OK. WTEC III transmission controls. WTEC III dashboard cable assembly OK. Rear lights cable assembly OK. NO Replace WTEC III transmission ECU (para 8-7). YES Replace WTEC III relay K25 (para 7-9). Faulty WTEC III relay K25. Faulty WTEC III transmission ECU.