DTC 15: Up-down Motor Malfunction: Procedure

1. Disconnect the Q12 access seat cylinder assembly (up-down motor) connector.
   Fig 1: Checking Q12 Access Seat Cylinder Assembly (Up-Down Motor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   Q12-1 (UMUP) - Body ground	No. 2 power seat switch assembly (ingress switch) off → on	Below 1 V → 11 to 14 V
   Q12-2 (UMDW) - Body ground	No. 2 power seat switch assembly (egress switch) off → on	Below 1 V → 11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Access Seat Cylinder Assembly (Up-down Motor))

3. Reconnect the access seat cylinder assembly (up-down motor) connector.

NG → See step   2 

OK → See step   7 

1. Disconnect the Q5 power lift motor relay (raise relay) connector.
   Fig 2: Checking Q5 & Q6 Power Lift Motor Relay (Raise & Lower Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the Q6 power lift motor relay (lower relay) connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Q5-5 (URB) - Body ground	Always	11 to 14 V
   Q6-5 (DRB) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Lift Motor Relay (Raise Relay))
   *b	Front view of wire harness connector (to Power Lift Motor Relay (Lower Relay))

4. Reconnect the power lift motor relay (raise relay) connector.
5. Reconnect the power lift motor relay (lower relay) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the power lift motor relay (raise relay). Refer to DISASSEMBLY .
   Fig 3: Identifying Test Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (URMT) - 4 (URE2)	Battery voltage not applied	Below 1 Ω
   	Battery voltage applied to terminals 1 (URE1) and 2 (UREC)	10 kΩ or higher
   3 (URMT) - 5 (URB)	Battery voltage not applied	10 kΩ or higher
   	Battery voltage applied to terminals 1 (URE1) and 2 (UREC)	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Power Lift Motor Relay (Raise Relay))

3. Reinstall the power lift motor relay (raise relay).

NG → See step   8 

OK: Go to next step 

1. Remove the power lift motor relay (lower relay). Refer to DISASSEMBLY .
   Fig 4: Identifying Test Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (DRMT) - 4 (DRE2)	Battery voltage not applied	Below 1 Ω
   	Battery voltage applied to terminals 1 (DRE1) and 2 (DREC)	10 kΩ or higher
   3 (DRMT) - 5 (DRB)	Battery voltage not applied	10 kΩ or higher
   	Battery voltage applied to terminals 1 (DRE1) and 2 (DREC)	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Power Lift Motor Relay (Lower Relay))

3. Reinstall the power lift motor relay (lower relay).

NG → See step   9 

OK: Go to next step 

1. Disconnect the Q5 power lift motor relay (raise relay) connector.
2. Disconnect the Q3 position control ECU assembly connector.
3. Disconnect the Q12 access seat cylinder assembly (up-down motor) connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q5-2 (UREC) - Q3-15 (LFUP)	Always	Below 1 Ω
   Q5-3 (URMT) - Q12-1 (UMUP)	Always	Below 1 Ω
   Q5-1 (URE1) - Body ground	Always	Below 1 Ω
   Q5-4 (URE2) - Body ground	Always	Below 1 Ω
   Q3-15 (LFUP) - Body ground	Always	10 kΩ or higher

5. Reconnect the access seat cylinder assembly (up-down motor) connector.
6. Reconnect the position control ECU assembly connector.
7. Reconnect the power lift motor relay (raise relay) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the Q6 power lift motor relay (lower relay) connector.
2. Disconnect the Q2 position control ECU assembly connector.
3. Disconnect the Q12 access seat cylinder assembly (up-down motor) connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q6-2 (DREC) - Q2-5 (LFDN)	Always	Below 1 Ω
   Q6-3 (DRMT) - Q12-2 (UMDW)	Always	Below 1 Ω
   Q6-1 (DRE1) - Body ground	Always	Below 1 Ω
   Q6-4 (DRE2) - Body ground	Always	Below 1 Ω
   Q2-5 (LFDN) - Body ground	Always	10 kΩ or higher

5. Reconnect the access seat cylinder assembly (up-down motor) connector.
6. Reconnect the position control ECU assembly connector.
7. Reconnect the power lift motor relay (lower relay) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10