DTC B1016:24 [REAR POWER SEAT CONTROL MODULE (LH)]

id0902t2549900

Description

Limit switch (LH) input circuit malfunction

Detection condition

•  Rear power seat control module (LH) detects that the limit switch No.1 (LH) input circuit is stuck on or the limit switch No.2 (LH) input circuit is stuck off.

Fail-safe

•  Inhibits the rear power walk-in operation function from being driven.

•  Inhibits the rear power walk-in return function from being driven.

Possible cause

•  Limit switch No.2 (LH) connector or terminal malfunction

•  Open circuit in wiring harness between limit switch No.2 (LH) terminal B and body ground

•  Rear power seat control module (LH) connector or terminal malfunction

•  Open circuit in wiring harness between rear power seat control module (LH) terminal 2N and limit switch No.2 (LH) terminal A

•  Limit switch No.1 (LH) connector or terminal malfunction

•  Short to ground in wiring harness between rear power seat control module (LH) terminal 3N and limit switch No.1 (LH) terminal A

•  Limit switch No.1 (LH) circuits are shorted to each other

•  Limit switch No.1 (LH) malfunction

•  Limit switch No.2 (LH) malfunction

•  Rear power seat control module (LH) malfunction

Description	Limit switch (LH) input circuit malfunction
Detection condition	• Rear power seat control module (LH) detects that the limit switch No.1 (LH) input circuit is stuck on or the limit switch No.2 (LH) input circuit is stuck off.
Fail-safe	• Inhibits the rear power walk-in operation function from being driven. • Inhibits the rear power walk-in return function from being driven.
Possible cause	• Limit switch No.2 (LH) connector or terminal malfunction • Open circuit in wiring harness between limit switch No.2 (LH) terminal B and body ground • Rear power seat control module (LH) connector or terminal malfunction • Open circuit in wiring harness between rear power seat control module (LH) terminal 2N and limit switch No.2 (LH) terminal A • Limit switch No.1 (LH) connector or terminal malfunction • Short to ground in wiring harness between rear power seat control module (LH) terminal 3N and limit switch No.1 (LH) terminal A • Limit switch No.1 (LH) circuits are shorted to each other • Limit switch No.1 (LH) malfunction • Limit switch No.2 (LH) malfunction • Rear power seat control module (LH) malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT LIMIT SWITCH No.2 (LH) CONNECTOR CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

•  Disconnect the limit switch No.2 (LH) 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 and/or terminals, then go to Step 10.

2

INSPECT LIMIT SWITCH No.2 (LH) GROUND CIRCUIT FOR OPEN CIRCUIT

•  Verify that the limit switch No.2 (LH) connector is disconnected.

•  Inspect for continuity between limit switch No.2 (LH) terminal B (wiring harness-side) and body ground.

•  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 limit switch No.2 (LH) terminal B and body ground.

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 Step 10.

3

INSPECT REAR POWER SEAT CONTROL MODULE (LH) CONNECTOR CONDITION

•  Disconnect the rear power seat control module (LH) 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 and/or terminals, then go to Step 10.

4

INSPECT LIMIT SWITCH No.2 (LH) CIRCUIT FOR OPEN CIRCUIT

•  Verify that the limit switch No.2 (LH) and rear power seat control module (LH) connectors are disconnected.

•  Inspect for continuity between rear power seat control module (LH) terminal 2N (wiring harness-side) and limit switch No.2 (LH) terminal A (wiring harness-side).

•  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 rear power seat control module (LH) terminal 2N and limit switch No.2 (LH) terminal A.

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 Step 10.

5

INSPECT LIMIT SWITCH No.1 (LH) CONNECTOR CONDITION

•  Disconnect the limit switch No.1 (LH) 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 and/or terminals, then go to Step 10.

6

INSPECT LIMIT SWITCH No.1 (LH) CIRCUIT FOR SHORT TO GROUND

•  Verify that the limit switch No.1 (LH) and rear power seat control module (LH) connectors are disconnected.

•  Inspect for continuity between rear power seat control module (LH) terminal 3N (wiring harness-side) and body ground.

•  Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between rear power seat control module (LH) terminal 3N and limit switch No.1 (LH) terminal A.

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 10.

No

Go to the next step.

7

INSPECT LIMIT SWITCH No.1 (LH) CIRCUITS FOR SHORT TO EACH OTHER

•  Verify that the limit switch No.1 (LH) and rear power seat control module (LH) connectors are disconnected.

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

―  Rear power seat control module (LH) terminal 3N, 3I

―  Rear power seat control module (LH) terminal 3N, 3J

•  Is there continuity?

Yes

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

•  Rear power seat control module (LH) terminal 3N—limit switch No.1 (LH) terminal A

•  Rear power seat control module (LH) terminal 3I—Limit switch No.1 (LH) terminal B

•  Rear power seat control module (LH) terminal 3J circuit

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 each other.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the malfunctioning wiring harness.

Go to Step 10.

No

Go to the next step.

8

INSPECT LIMIT SWITCH No.1 (LH) AND LIMIT SWITCH No.2 (LH)

•  Inspect the limit switch No.1 (LH) and limit switch No.2 (LH).
(See LIMIT SWITCH INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

Replace the second-row seat (LH), then go to Step 10.

(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)

9

INSPECT REAR POWER SEAT CONTROL MODULE (LH)

•  Inspect the rear power seat control module (LH).
(See REAR POWER SEAT CONTROL MODULE (LH) INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

Replace the second-row seat (LH), then go to the next step.

(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)

10

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Reconnect all the disconnected connectors with the negative battery terminal disconnected.

•  Connect the negative battery terminal.
(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

•  Clear the DTC for the rear power seat control module (LH) using the M-MDS.
(See CLEARING DTC [REAR POWER SEAT CONTROL MODULE (LH)].)

•  Retrieve the rear power seat control module (LH) DTCs using the M-MDS.
(See DTC INSPECTION [REAR POWER SEAT CONTROL MODULE (LH)].)

•  Is the same Pending DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the second-row seat (LH).
(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

11

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 [REAR POWER SEAT CONTROL MODULE (LH)].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT LIMIT SWITCH No.2 (LH) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the limit switch No.2 (LH) 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.
1		No	Repair or replace the connector and/or terminals, then go to Step 10.
2	INSPECT LIMIT SWITCH No.2 (LH) GROUND CIRCUIT FOR OPEN CIRCUIT • Verify that the limit switch No.2 (LH) connector is disconnected. • Inspect for continuity between limit switch No.2 (LH) terminal B (wiring harness-side) and body ground. • Is there continuity?	Yes	Go to the next step.
2		No	Refer to the wiring diagram and verify whether or not there is a common connector between limit switch No.2 (LH) terminal B and body ground. 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 Step 10.
3	INSPECT REAR POWER SEAT CONTROL MODULE (LH) CONNECTOR CONDITION • Disconnect the rear power seat control module (LH) 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.
3		No	Repair or replace the connector and/or terminals, then go to Step 10.
4	INSPECT LIMIT SWITCH No.2 (LH) CIRCUIT FOR OPEN CIRCUIT • Verify that the limit switch No.2 (LH) and rear power seat control module (LH) connectors are disconnected. • Inspect for continuity between rear power seat control module (LH) terminal 2N (wiring harness-side) and limit switch No.2 (LH) terminal A (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify whether or not there is a common connector between rear power seat control module (LH) terminal 2N and limit switch No.2 (LH) terminal A. 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 Step 10.
5	INSPECT LIMIT SWITCH No.1 (LH) CONNECTOR CONDITION • Disconnect the limit switch No.1 (LH) 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.
5		No	Repair or replace the connector and/or terminals, then go to Step 10.
6	INSPECT LIMIT SWITCH No.1 (LH) CIRCUIT FOR SHORT TO GROUND • Verify that the limit switch No.1 (LH) and rear power seat control module (LH) connectors are disconnected. • Inspect for continuity between rear power seat control module (LH) terminal 3N (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between rear power seat control module (LH) terminal 3N and limit switch No.1 (LH) terminal A. 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 10.
6		No	Go to the next step.
7	INSPECT LIMIT SWITCH No.1 (LH) CIRCUITS FOR SHORT TO EACH OTHER • Verify that the limit switch No.1 (LH) and rear power seat control module (LH) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Rear power seat control module (LH) terminal 3N, 3I ― Rear power seat control module (LH) terminal 3N, 3J • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following circuits: • Rear power seat control module (LH) terminal 3N—limit switch No.1 (LH) terminal A • Rear power seat control module (LH) terminal 3I—Limit switch No.1 (LH) terminal B • Rear power seat control module (LH) terminal 3J circuit 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 each other. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the malfunctioning wiring harness. Go to Step 10.
7		No	Go to the next step.
8	INSPECT LIMIT SWITCH No.1 (LH) AND LIMIT SWITCH No.2 (LH) • Inspect the limit switch No.1 (LH) and limit switch No.2 (LH). (See LIMIT SWITCH INSPECTION.) • Is the part normal?	Yes	Go to the next step.
8		No	Replace the second-row seat (LH), then go to Step 10. (See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
9	INSPECT REAR POWER SEAT CONTROL MODULE (LH) • Inspect the rear power seat control module (LH). (See REAR POWER SEAT CONTROL MODULE (LH) INSPECTION.) • Is the part normal?	Yes	Go to the next step.
9		No	Replace the second-row seat (LH), then go to the next step. (See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
10	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors with the negative battery terminal disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the rear power seat control module (LH) using the M-MDS. (See CLEARING DTC [REAR POWER SEAT CONTROL MODULE (LH)].) • Retrieve the rear power seat control module (LH) DTCs using the M-MDS. (See DTC INSPECTION [REAR POWER SEAT CONTROL MODULE (LH)].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the second-row seat (LH). (See SECOND-ROW SEAT REMOVAL/INSTALLATION.) Go to the next step.
10		No	Go to the next step.
11	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 [REAR POWER SEAT CONTROL MODULE (LH)].)
11		No	DTC troubleshooting completed.