DTC B139D:24 [REAR POWER SEAT CONTROL MODULE (RH)]

id0902t3571000

Description

Walk-in switch (seat back-side) (RH) input circuit malfunction

Detection condition

•  Rear power seat control module (RH) detects that the walk-in switch (seat back-side) (RH) input circuit is stuck on.

Fail-safe

•  Inhibits the rear power walk-in operation function from being driven by the walk-in switch (seat back-side).

•  Inhibits the rear power walk-in return function from being driven by the walk-in switch (seat back-side).

Possible cause

•  Walk-in switch (seat back-side) (RH) connector or terminal malfunction

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

•  Short to ground in wiring harness between rear power seat control module (RH) terminal 3K and walk-in switch (seat back-side) (RH) terminal A

•  Walk-in switch (seat back-side) (RH) circuits are shorted to each other

•  Walk-in switch (seat back-side) (RH) malfunction

•  Rear power seat control module (RH) malfunction

Description	Walk-in switch (seat back-side) (RH) input circuit malfunction
Detection condition	• Rear power seat control module (RH) detects that the walk-in switch (seat back-side) (RH) input circuit is stuck on.
Fail-safe	• Inhibits the rear power walk-in operation function from being driven by the walk-in switch (seat back-side). • Inhibits the rear power walk-in return function from being driven by the walk-in switch (seat back-side).
Possible cause	• Walk-in switch (seat back-side) (RH) connector or terminal malfunction • Rear power seat control module (RH) connector or terminal malfunction • Short to ground in wiring harness between rear power seat control module (RH) terminal 3K and walk-in switch (seat back-side) (RH) terminal A • Walk-in switch (seat back-side) (RH) circuits are shorted to each other • Walk-in switch (seat back-side) (RH) malfunction • Rear power seat control module (RH) malfunction

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) CONNECTOR CONDITION

•  Switch the ignition off.

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

•  Disconnect the walk-in switch (seat back-side) (RH) 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 7.

2

INSPECT REAR POWER SEAT CONTROL MODULE (RH) CONNECTOR CONDITION

•  Disconnect the rear power seat control module (RH) 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 7.

3

INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) CIRCUIT FOR SHORT TO GROUND

•  Verify that the walk-in switch (seat back-side) (RH) and rear power seat control module (RH) connectors are disconnected.

•  Inspect for continuity between rear power seat control module (RH) terminal 3K (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 (RH) terminal 3K and walk-in switch (seat back-side) (RH) 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 7.

No

Go to the next step.

4

INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) CIRCUITS FOR SHORT TO EACH OTHER

•  Verify that the walk-in switch (seat back-side) (RH) and rear power seat control module (RH) connectors are disconnected.

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

―  Rear power seat control module (RH) terminal 3K, 3I

―  Rear power seat control module (RH) terminal 3K, 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 (RH) terminal 3K—Walk-in switch (seat back-side) (RH) terminal A

•  Rear power seat control module (RH) terminal 3I—Walk-in switch (seat back-side) (RH) terminal B

•  Rear power seat control module (RH) 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 7.

No

Go to the next step.

5

INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH)

•  Inspect the walk-in switch (seat back-side) (RH).
(See WALK-IN SWITCH INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

Replace the walk-in switch (seat back-side) (RH), then go to Step 7.

(See WALK-IN SWITCH REMOVAL/INSTALLATION.)

6

INSPECT REAR POWER SEAT CONTROL MODULE (RH)

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

•  Is the part normal?

Yes

Go to the next step.

No

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

(See SECOND-ROW SEAT REMOVAL/INSTALLATION.)

7

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 (RH) using the M-MDS.
(See CLEARING DTC [REAR POWER SEAT CONTROL MODULE (RH)].)

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

•  Is the same Pending DTC present?

Yes

Repeat the inspection from Step 1.

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

Go to the next step.

No

Go to the next step.

8

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 (RH)].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the walk-in switch (seat back-side) (RH) 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 7.
2	INSPECT REAR POWER SEAT CONTROL MODULE (RH) CONNECTOR CONDITION • Disconnect the rear power seat control module (RH) 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.
2		No	Repair or replace the connector and/or terminals, then go to Step 7.
3	INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) CIRCUIT FOR SHORT TO GROUND • Verify that the walk-in switch (seat back-side) (RH) and rear power seat control module (RH) connectors are disconnected. • Inspect for continuity between rear power seat control module (RH) terminal 3K (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 (RH) terminal 3K and walk-in switch (seat back-side) (RH) 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 7.
3		No	Go to the next step.
4	INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) CIRCUITS FOR SHORT TO EACH OTHER • Verify that the walk-in switch (seat back-side) (RH) and rear power seat control module (RH) connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― Rear power seat control module (RH) terminal 3K, 3I ― Rear power seat control module (RH) terminal 3K, 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 (RH) terminal 3K—Walk-in switch (seat back-side) (RH) terminal A • Rear power seat control module (RH) terminal 3I—Walk-in switch (seat back-side) (RH) terminal B • Rear power seat control module (RH) 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 7.
4		No	Go to the next step.
5	INSPECT WALK-IN SWITCH (SEAT BACK-SIDE) (RH) • Inspect the walk-in switch (seat back-side) (RH). (See WALK-IN SWITCH INSPECTION.) • Is the part normal?	Yes	Go to the next step.
5		No	Replace the walk-in switch (seat back-side) (RH), then go to Step 7. (See WALK-IN SWITCH REMOVAL/INSTALLATION.)
6	INSPECT REAR POWER SEAT CONTROL MODULE (RH) • Inspect the rear power seat control module (RH). (See REAR POWER SEAT CONTROL MODULE (RH) INSPECTION.) • Is the part normal?	Yes	Go to the next step.
6		No	Replace the second-row seat (RH), then go to the next step. (See SECOND-ROW SEAT REMOVAL/INSTALLATION.)
7	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 (RH) using the M-MDS. (See CLEARING DTC [REAR POWER SEAT CONTROL MODULE (RH)].) • Retrieve the rear power seat control module (RH) DTCs using the M-MDS. (See DTC INSPECTION [REAR POWER SEAT CONTROL MODULE (RH)].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the second-row seat (RH). (See SECOND-ROW SEAT REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	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 (RH)].)
8		No	DTC troubleshooting completed.