DTC B1B87-13: Lift Motor And Position Sensor Circuit Malfunction [Position Memory Control Module]: Notes

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DTC B1B87:13 (POSITION MEMORY CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Lift motor and position sensor circuit malfunction
Detection condition	Position memory control module (front seat) detects the following conditions during the lift motor operation control: Detects 4 times that current flowing to the lift motor is less than 1 A. Detects for 0.2 s that there is no change in the lift sensor pulse. Position memory control module (front seat) detects any of the following conditions during the lift motor not operation control: Detects 4 times that current flowing to the lift motor exceeds 10 A. Detects 4 times that current flowing to the lift motor exceeds 1 A and a change in the lift sensor pulse 5 times within 1 s. Position memory control module (front seat) detects for 5 s that there is no change in the lift sensor pulse during the lift motor operation control.
Fail-safe	Memory clearing: If there is a malfunction in the lift position sensor, clear all the memory positions. Memory seat positioning using position memory switch and remote transmitter: If there is a malfunction in the lift position sensor, inhibits all memory seat positioning. If there is a malfunction in the lift motor, inhibits lift motor seat positioning. Lift motor seat positioning using power seat switch: If there is a malfunction in the lift motor, inhibits lift motor seat positioning. Memory registration using position memory switch and remote transmitter: If there is a malfunction in the lift position sensor, inhibits the memory registration. If there is a malfunction in the lift motor and the malfunction is caused by short circuit, inhibits the memory registration.
Possible cause	Lift motor and position sensor connector or terminal malfunction Position memory control module (front seat) connector or terminal malfunction Short to ground in wiring harness between the following terminals: Position memory control module (front seat) terminal 3E-Lift motor and position sensor terminal A Position memory control module (front seat) terminal 3F-Lift motor and position sensor terminal B Position memory control module (front seat) terminal 3M-Lift motor and position sensor terminal C Position memory control module (front seat) terminal 3N-Lift motor and position sensor terminal D Short to power supply in wiring harness between the following terminals: Position memory control module (front seat) terminal 3E-Lift motor and position sensor terminal A Position memory control module (front seat) terminal 3F-Lift motor and position sensor terminal B Position memory control module (front seat) terminal 3M-Lift motor and position sensor terminal C Position memory control module (front seat) terminal 3N-Lift motor and position sensor terminal D Open circuit in wiring harness between the following terminals: Position memory control module (front seat) terminal 3E-Lift motor and position sensor terminal A Position memory control module (front seat) terminal 3F-Lift motor and position sensor terminal B Position memory control module (front seat) terminal 3M-Lift motor and position sensor terminal C Position memory control module (front seat) terminal 3N-Lift motor and position sensor terminal D Front seat malfunction Lift motor and position sensor malfunction Position memory control module (front seat) malfunction
Courtesy of MAZDA MOTORS CORP.