Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / Multiplex Communication / Lin Communication System / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the 1D and 1F driver side junction block connectors.

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

HINT:

Measure the values on the wire harness side with the connectors disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
1F-15 (BECU) - Body ground	R - Body ground	Battery power supply	Always	11 to 14 V
1D-5 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
1D-12 (LIN2) - 1D-5 (GND1)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation
1D-13 (LIN2) - 1D-5 (GND1)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation
1D-25 (LIN2) - 1D-5 (GND1)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the main body ECU (multiplex network body ECU) or driver side junction block may be malfunctioning.

2. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY LH (w/ Jam Protection Function)

(a) Disconnect the P24 front power window regulator motor assembly LH connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P24-2 (B) - P24-1 (GND)	R - W-B	Battery power supply	Always	11 to 14 V
P24-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P24-9 (LIN) - P24-1 (GND)	GR - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the front power window regulator motor assembly LH may be malfunctioning.

3. CHECK FRONT POWER WINDOW REGULATOR MOTOR ASSEMBLY RH (w/ Jam Protection Function)

(a) Disconnect the P22 front power window regulator motor assembly RH connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P22-2 (B) - P22-1 (GND)	W - W-B	Battery power supply	Always	11 to 14 V
P22-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P22-9 (LIN) - P22-1 (GND)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the front power window regulator motor assembly RH may be malfunctioning.

4. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (for Double Cab with Jam Protection Function)

(a) Disconnect the P18 power window regulator master switch assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P18-3 (B) - P18-1 (GND)	R - W-B	Battery power supply	Always	11 to 14 V
P18-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P18-6 (LIN1) - P18-1 (GND)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation
P18-7 (LIN2) - P18-1 (GND)	GR - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the power window regulator master switch assembly may be malfunctioning.

5. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (for Access Cab with Jam Protection Function)

(a) Disconnect the P23 power window regulator master switch assembly connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P23-11 (B) - P23-12 (GND)	R - W-B	Battery power supply	Always	11 to 14 V
P23-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
P23-17 (LIN1) - P23-12 (GND)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation
P23-16 (LIN2) - P23-12 (GND)	GR - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the power window regulator master switch assembly may be malfunctioning.

6. CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) (w/ Sliding Roof)

(a) Disconnect the S50 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
S50-8 (B) - S50-12 (E)	W - W-B	Battery power supply	Always	11 to 14 V
S50-12 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
S50-11 (LIN) - S50-12 (E)	V - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the sliding roof ECU (sliding roof drive gear sub-assembly) may be malfunctioning.

7. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Smart Key System)

(a) Disconnect the C29 certification ECU (smart key ECU assembly) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
C29-10 (+B) - C29-11 (E)	P - W-B	Battery power supply	Always	11 to 14 V
C29-11 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, there may be a malfunction in the wire harness.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
C29-6 (LIN) - C29-11 (E)	L - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.

8. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) (w/ Smart Key System)

(a) Disconnect the S45 steering lock ECU (steering lock actuator or upper bracket assembly) connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
S45-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
S45-7 (B) - S45-1 (GND)	R - W-B	Battery power supply	Always	11 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection	Wiring Color	Terminal Description	Condition	Specified Condition
S45-5 (LIN) - S45-1 (GND)	L - W-B	LIN communication line	Ignition switch ON	Pulse generation

If the result is not as specified, the steering lock ECU (steering lock actuator or upper bracket assembly) may be malfunctioning.

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