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SE-78 AUTOMATIC DRIVE POSITIONER Check UART Communication Line Circuit NIS001IG 1. CHECK UART LINE HERNESS 1. Turn ignition switch OFF. 2. Disconnect driver seat control unit connector and automatic drive positioner control unit connector. 3. Check continuity between driver seat control unit connector 4. Check continuity between driver seat control unit connector OK or NG OK >> GO TO 2. NG >> Repair or replace harness between driver seat control unit and automatic drive positioner control unit. 2. CHECK UART LINE SIGNAL 1 1. Turn ignition switch ON. 2. Check signal between driver seat control unit connector ground, with oscilloscope. OK or NG OK >> GO TO 3. NG >> Check the flowing. ● When voltage signal does not appear with a constant voltage (approx. 5V), replace driver seat ● When voltage signal does not appear with a constant voltage (approx. 0V), replace automatic 17 (R/Y) − 26 (R/G) : Continuity should exist. 1 (L/W) − 10 (R/L) : Continuity should exist. 17 (R/Y) − Ground : Continuity should not exist. 1 (L/W) − Ground : Continuity should not exist. PIIB3418E Connector Terminals (Wire color) Condition Signal (Reference value) (+) (–) B352 17 (R/Y) Ground Seat PIIB7644E PIIA4814E |