Description

Open circuit in steering switch

Detection condition

• Start stop unit detects an open circuit in the steering switch circuit for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

Not applicable

Possible cause

• Clock spring connector or terminal malfunction

• Clock spring malfunction

• Start stop unit connector or terminal malfunction

• Open circuit in wiring harness between the following terminals:

• Start stop unit terminal 1AA—Clock spring terminal 1K

• Start stop unit terminal 1AB—Clock spring terminal 1C

• Steering switch malfunction

• Start stop unit malfunction

Step

Inspection

Action

1

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the clock spring 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, then go to Step 6.

2

• Inspect the clock spring.

  (See CLOCK SPRING INSPECTION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

  (See CLOCK SPRING INSPECTION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

• Is the clock spring normal?

Yes

Go to the next step.

No

Replace the clock spring, then go to Step 6.

(See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)

(See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

3

• Disconnect the start stop unit 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, then go to Step 6.

4

• Verify that the clock spring and start stop unit connectors are disconnected.

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

• Start stop unit terminal 1AA—Clock spring terminal 1K

• Start stop unit terminal 1AB—Clock spring terminal 1C

• 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 the following terminals:

• Start stop unit terminal 1AA—Clock spring terminal 1K

• Start stop unit terminal 1AB—Clock spring terminal 1C

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 6.

5

• Inspect the steering switch.

  (See STEERING SWITCH INSPECTION.)

• Is the steering switch normal?

Yes

Go to the next step.

No

Replace the steering switch, then go to the next step.

(See STEERING SWITCH REMOVAL/INSTALLATION.)

6

• Always reconnect all disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear the DTC for the start stop unit using the M-MDS.

  (See CLEARING DTC [START STOP UNIT].)

• Switch the ignition ON (engine off or on) and wait for 5 s or more.

• Retrieve the start stop unit DTCs using the M-MDS.

  (See DTC INSPECTION [START STOP UNIT].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the start stop unit.

  (See START STOP UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

7

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [START STOP UNIT].)

No

DTC troubleshooting completed.