Inspection Procedure

PREPARATION: 

Remove Power Seat Position ECU with connectors still connected.

CHECK: 

Measure voltage between terminals +B and GND of Power Seat Position ECU connector.

OK: 

Voltage: 10 - 14 V 

Fig 1: Measuring Voltage Between Terminals +B And GND Of ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
2. NG: Go to next step. 

CHECK: 

Measure resistance between terminal GND of Power Seat Position ECU and body ground.

OK: 

Resistance: Continuity (below 1 Ω) 

Fig 2: Measuring Resistance Between Terminal GND & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Repair or replace harness or connector. 
2. OK: Go to next step. 

PREPARATION: 

Remove Power Seat Position ECU with connectors still connected.

CHECK: 

Measure voltage between terminals SYSB and SGND of Power Seat Position ECU connector.

OK: 

Voltage: 10 - 14 V 

Fig 3: Measuring Voltage Between Terminal SYSB And SGND Of ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Proceed to next circuit inspection shown in problem symptoms table (See  PROBLEM SYMPTOMS TABLE  ). 
2. NG: Go to next step. 

CHECK: 

Measure resistance between terminals SGND of Power Seat Position ECU and body ground.

OK: 

Resistance: Continuity (below 1 Ω) 

Fig 4: Measuring Resistance Between SGND Terminal & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Repair or replace harness or connector. 
2. OK: Go to next step. 

1. NG: Check for short in all the harness and components connected to SEAT-FR and DOME fuse, and repair them (See attached wiring diagram). 
2. OK: Check and repair connector between Power Seat Position ECU and battery.