Toyota Tundra Service Manual: Terminals Of Ecu

Toyota Tundra Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/ Memory) / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY

(a) Disconnect the Z9 and Z10 position control ECU and switch assembly connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
Z9-2 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
Z9-7 (+B1) - Z9-2 (GND1)	W - W-B	Battery (ECU power source)	Always	11 to 14 V
Z10-12 (SYSB) - Z9-2 (GND1)	LG - W-B	Battery (ECU power source)	Always	11 to 14 V
Z10-10 (DBCL) - Z10-1 (SGND)	P - BR	Front seat inner belt buckle switch signal	Seat belt unfastened	Below 1 Ω
Z10-10 (DBCL) - Z10-1 (SGND)	P - BR	Front seat inner belt buckle switch signal	Seat belt fastened	10 kΩ or higher

(d) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
Z9-1 (GND2) - Body ground	W-B - Body ground	Lumbar support adjuster ground	Always	Below 1 Ω
Z9-3 (SLD+) - Z9-2 (GND1)	L - W-B	Sliding motor signal (forward)	Seat moving forward using sliding switch	11 to 14 V
Z9-3 (SLD+) - Z9-2 (GND1)	L - W-B	Sliding motor signal (forward)	OFF	Below 1 V
Z9-4 (SLD-) - Z9-2 (GND1)	GR - W-B	Sliding motor signal (rearward)	Seat moving rearward using sliding switch	11 to 14 V
Z9-4 (SLD-) - Z9-2 (GND1)	GR - W-B	Sliding motor signal (rearward)	OFF	Below 1 V
Z9-5 (FRV-) - Z9-2 (GND1)	R - W-B	Front Vertical motor signal (downward)	Seat cushion front portion downward using front vertical switch	11 to 14 V
Z9-5 (FRV-) - Z9-2 (GND1)	R - W-B	Front Vertical motor signal (downward)	OFF	Below 1 V
Z9-6 (+B2) - Z9-1 (GND2)	LG - W-B	Lumbar support adjuster power source	Always	11 to 14 V
Z9-8 (FRV+) - Z9-2 (GND1)	B - W-B	Front vertical motor signal (upward)	Seat cushion front portion upward using front vertical switch	11 to 14 V
Z9-8 (FRV+) - Z9-2 (GND1)	B - W-B	Front vertical motor signal (upward)	OFF	Below 1 V
Z9-9 (RCL+) - Z9-2 (GND1)	LG - W-B	Reclining motor signal (forward)	Seatback moving forward using reclining switch	11 to 14 V
Z9-9 (RCL+) - Z9-2 (GND1)	LG - W-B	Reclining motor signal (forward)	OFF	Below 1 V
Z9-10 (LFT+) - Z9-2 (GND1)	V - W-B	Lift or motor signal (upward)	Seat cushion upward using lifter switch	11 to 14 V
Z9-10 (LFT+) - Z9-2 (GND1)	V - W-B	Lift or motor signal (upward)	OFF	Below 1 V
Z9-11 (RCL-) - Z9-2 (GND1)	P - W-B	Reclining motor signal (rearward)	Seatback moving rearward using reclining switch	11 to 14 V
Z9-11 (RCL-) - Z9-2 (GND1)	P - W-B	Reclining motor signal (rearward)	OFF	Below 1 V
Z9-12 (LFT-) - Z9-2 (GND1)	Y - W-B	Lift or motor signal (downward)	Seat cushion downward using lifter switch	11 to 14 V
Z9-12 (LFT-) - Z9-2 (GND1)	Y - W-B	Lift or motor signal (downward)	OFF	Below 1 V
Z10-1 (SGND) - Body ground	BR - Body ground	Position sensor ground	Always	Below 1 Ω
Z10-3 (SSFV) - Z10-1 (SGND)	R - BR	Vertical position signal	Front vertical function operation	4.5 to 4.8 V
Z10-4 (SSRL) - Z10-1 (SGND)	P - BR	Lift position signal	Lifter function operation	4.5 to 4.8 V
Z10-5 (SSRS) - Z10-1 (SGND)	G - BR	Slide position signal	Slide function operation	4.5 to 4.8 V
Z10-11 (SSRR) - Z10-1 (SGND)	O - BR	Reclining position signal	Reclining function operation	4.5 to 4.8 V

2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY

(a) Disconnect the N7 outer mirror control ECU assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
N7-3 (B) - N7-9 (GND)	R - W-B	Battery (ECU power source)	Always	11 to 14 V
N7-4 (ACC) - N7-9 (GND)	Y - W-B	Ignition power supply	Ignition switch off	Below 1 V
N7-4 (ACC) - N7-9 (GND)	Y - W-B	Ignition power supply	Ignition switch ACC	11 to 14 V
N7-9 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
N8-7 (M2) - N8-10 (MSWE)	BE - V	Memory 2 switch signal	Memory 2 switch off	11 to 14 V
N8-7 (M2) - N8-10 (MSWE)	BE - V	Memory 2 switch signal	Memory 2 switch on	Below 1 V
N8-8 (M1) - N8-10 (MSWE)	P - V	Memory 1 switch signal	Memory 1 switch off	11 to 14 V
N8-8 (M1) - N8-10 (MSWE)	P - V	Memory 1 switch signal	Memory 1 switch on	Below 1 V
N8-9 (MM) - N8-10 (MSWE)	L - V	Memory SET switch signal	Memory SET switch off	11 to 14 V
N8-9 (MM) - N8-10 (MSWE)	L - V	Memory SET switch signal	Memory SET switch on	Below 1 V

System Diagram

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Toyota Tundra Service Manual: Terminals Of Ecu

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