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2014 - Mazda6 - Body and Accessories

DTC B1B87:13 [POSITION MEMORY SYSTEM]



Description

Lift motor and position sensor circuit malfunction

Detection condition

  • Position memory control module 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 position sensor pulse.

  • Position memory control module detects any of the following conditions during the lift motor non-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 position sensor pulse 5 timeswithin 1 s.

  • Position memory control module detects for 5 s that there is no change in the lift position sensor pulse during the lift motor operation control.

Fail-safe function

  • Memory clearing:

    • If there is a malfunction in the lift position sensor, clears 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 connector or terminal malfunction

  • Short to ground in wiring harness between the following terminals:

    • Position memory control module terminal 3E—Lift motor and position sensor terminal A

    • Position memory control module terminal 3F—Lift motor and position sensor terminal B

    • Position memory control module terminal 3M—Lift motor and position sensor terminal C

    • Position memory control module terminal 3N—Lift motor and position sensor terminal D

  • Short to power supply in wiring harness between the following terminals:

    • Position memory control module terminal 3E—Lift motor and position sensor terminal A

    • Position memory control module terminal 3F—Lift motor and position sensor terminal B

    • Position memory control module terminal 3M—Lift motor and position sensor terminal C

    • Position memory control module terminal 3N—Lift motor and position sensor terminal D

  • Open circuit in wiring harness between the following terminals:

    • Position memory control module terminal 3E—Lift motor and position sensor terminal A

    • Position memory control module terminal 3F—Lift motor and position sensor terminal B

    • Position memory control module terminal 3M—Lift motor and position sensor terminal C

    • Position memory control module terminal 3N—Lift motor and position sensor terminal D

  • Front seat malfunction

    • Lift motor and position sensor malfunction

    • Position memory control module malfunction


Diagnostic Procedure

Step

Inspection

Action

1

 INSPECT LIFT MOTOR AND POSITION SENSOR CONNECTOR

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

  • Disconnect the lift motor and position sensor connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

2

 INSPECT POSITION MEMORY CONTROL MODULE CONNECTOR

  • Disconnect the position memory control module connector.

  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

  • Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

3

 INSPECT FOR SHORT TO GROUND IN LIFT MOTOR AND POSITION SENSOR CIRCUIT

  • Verify that the lift motor and position sensor and position memory control module connectors are disconnected.

  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:

    • Lift motor and position sensor terminal A

    • Lift motor and position sensor terminal B

    • Lift motor and position sensor terminal C

    • Lift motor and position sensor terminal D

  • Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Position memory control module terminal 3E—Lift motor and position sensor terminal A

  • Position memory control module terminal 3F—Lift motor and position sensor terminal B

  • Position memory control module terminal 3M—Lift motor and position sensor terminal C

  • Position memory control module terminal 3N—Lift motor and position sensor terminal D

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.

Go to Step 6.

No

Go to the next step.

4

 INSPECT FOR SHORT TO POWER SUPPLY IN LIFT MOTOR AND POSITION SENSOR CIRCUIT

  • Verify that the lift motor and position sensor and position memory control module connectors are disconnected.

  • Reconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

  • Switch the ignition ON (engine off or on).

  • Measure the voltage at the following terminals (wiring harness-side):

    • Lift motor and position sensor terminal A

    • Lift motor and position sensor terminal B

    • Lift motor and position sensor terminal C

    • Lift motor and position sensor terminal D

  • Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Position memory control module terminal 3E—Lift motor and position sensor terminal A

  • Position memory control module terminal 3F—Lift motor and position sensor terminal B

  • Position memory control module terminal 3M—Lift motor and position sensor terminal C

  • Position memory control module terminal 3N—Lift motor and position sensor terminal D

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 6.

5

 INSPECT FOR OPEN CIRCUIT IN LIFT MOTOR AND POSITION SENSOR CIRCUIT

  • Verify that the lift motor and position sensor and position memory control module connectors are disconnected.

  • Switch the ignition off.

  • Disconnect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

  • Inspect for continuity between the following terminals (wiring harness-side):

    • Position memory control module terminal 3E—Lift motor and position sensor terminal A

    • Position memory control module terminal 3F—Lift motor and position sensor terminal B

    • Position memory control module terminal 3M—Lift motor and position sensor terminal C

    • Position memory control module terminal 3N—Lift motor and position sensor terminal D

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Position memory control module terminal 3E—Lift motor and position sensor terminal A

  • Position memory control module terminal 3F—Lift motor and position sensor terminal B

  • Position memory control module terminal 3M—Lift motor and position sensor terminal C

  • Position memory control module terminal 3N—Lift motor and position sensor terminal D

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to the next step.

6

 VERIFY THAT REPAIRS HAVE BEEN COMPLETED

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

7

 VERIFY IF OTHER DTCs DISPLAYED

  • Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [POSITION MEMORY SYSTEM].)

No

DTC troubleshooting completed.



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