Backup light switch system check (BCM)

1. Body control system check

Refer to "64.Body Control 10I.Troubleshooting(BCM) diagnostic system check-body controls".

2. Back up light switch signal check

1) Connect the scan tool.

2) Turn ON the ignition switch.

3) Operate the gearshift lever (MT models) or selector lever (AT models) to the R position.

4) Observe the Back Lamp Switch (M02-3) parameter on the scan tool. Does the Back Lamp Switch (M02-3) parameter change when the shift lever is operated?

Yes

The system is normal.

No (Normally OFF)

=>Go to Fuse inspection.

No (Normally ON)

=>Go to Inspection for short circuit in back up light switch.

3. Fuse inspection

1) Turn OFF the ignition switch.

2) Inspect the BACK UP 7.5A fuse. Is the result normal?

Yes

=>Go to Inspection for open circuit in back up light switch.

No

Replace the fuse. If the fuse blows out again, repair the short to ground in the circuits relating to the fuse.

=>Go to Repair verification.

4. Inspection for open circuit in back up light switch

1) Turn OFF the ignition switch.

2) Disconnect the back up light switch harness connector (E35) or inhibitor switch harness connector (E41).

3) Connect a fused jumper wire between the signal circuit and the power supply circuit of the back up light switch harness connector (pins 1 and 2 of E35). (MT models)

4) Connect a fused jumper wire between the R position signal circuit and the power supply circuit of the inhibitor switch harness connector (pins 1 and 2 of E41). (AT models)

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

5) Turn ON the ignition switch.

6) Observe the Back Lamp Switch (M02-3) parameter on the scan tool. Does the Back Lamp Switch (M02-3) parameter show ON?

Yes (MT models)

=>Go to Back up light switch harness connector inspection.

Yes (AT models)

=>Go to Inhibitor switch harness connector inspection.

No

=>Go to Inspection for open circuit in back up light switch power supply circuit.

5. Inspection for open circuit in back up light switch power supply circuit

1) Disconnect the fused jumper wire.

2) Connect a test lamp between the power supply circuit (pin 1 of E35 for MT models [4JJ3 engine models] or pin 2 of E35 [RZ4E engine models], pin 2 of E41 for AT models) and the body ground. Does the test lamp illuminate?

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to Inspection for open circuit in back up light switch signal circuit.

No

Repair the open circuit or high resistance in the power supply circuit between the BACK UP 7.5A fuse and the back up light switch (pin 1 of E35 [4JJ3 engine models] or pin 2 of E35 [RZ4E engine models]), or between the BACK UP 7.5A fuse and the inhibitor switch (pin 2 of E41).

=>Go to Repair verification.

6. Inspection for open circuit in back up light switch signal circuit

1) Turn OFF the ignition switch.

2) Disconnect the BCM harness connector (C17).

3) Inspect the signal circuit between the BCM (pin 3 of C17) and the back up light switch (pin 2 of E35 [4JJ3 engine models] or pin 1 of E35 [RZ4E engine models]) or between the BCM (pin 3 of C17) and the inhibitor switch (pin 1 of E41) for an open circuit or high resistance. Is the result normal?

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to BCM harness connector inspection.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. Inspection for short circuit in back up light switch

1) Turn OFF the ignition switch.

2) Disconnect the back up light switch harness connector (E35) or inhibitor switch harness connector (E41).

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

3) Turn ON the ignition switch.

4) Observe the Back Lamp Switch (M02-3) parameter on the scan tool. Does the Back Lamp Switch (M02-3) parameter show OFF?

Yes (MT models)

=>Go to Back up light switch harness connector inspection.

Yes (AT models)

=>Go to Inhibitor switch harness connector inspection.

No

=>Go to Inspection for short circuit in back up light switch signal circuit.

8. Inspection for short circuit in back up light switch signal circuit

1) Turn OFF the ignition switch.

2) Disconnect the BCM harness connector (C17).

3) Turn ON the ignition switch.

4) Connect a test lamp between the BCM harness connector (pin 3 of C17) and the body ground. Does the test lamp illuminate?

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

Repair the short to the battery power supply circuit or the short to the ignition power supply circuit between the BCM (pin 3 of C17) and the back up light switch (pin 2 of E35 [4JJ3 engine models] or pin 1 of E35 [RZ4E engine models]), or between the BCM (pin 3 of C17) and the inhibitor switch (pin 1 of E41).

=>Go to Repair verification.

No

=>Go to BCM replacement.

9. Back up light switch harness connector inspection

1) Inspect for poor connections at the back up light switch harness connector (pins 1 and 2 of E35). Is the connection status normal?

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

Replace the backup light switch.

Refer to "5.Transmission, Transaxle 5C.Manual(MVL) transmission removal".

Refer to "5.Transmission, Transaxle 5C.Manual(MVL) transmission disassembly".

Refer to "5.Transmission, Transaxle 5C.Manual(MVL) transmission reassembly".

Refer to "5.Transmission, Transaxle 5C.Manual(MVL) transmission installation".

=>Go to Repair verification.

No

Repair the connections as necessary.

=>Go to Repair verification.

10. Inhibitor switch harness connector inspection

1) Inspect for poor connections at the inhibitor switch harness connector (pins 1 and 2 of E41). Is the connection status normal?

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

Replace the inhibitor switch.

Refer to "5.Transmission, Transaxle 5B.Automatic(AWR6B45) inhibitor switch removal".

Refer to "5.Transmission, Transaxle 5B.Automatic(AWR6B45) inhibitor switch installation".

=>Go to Repair verification.

No

Repair the connections as necessary.

=>Go to Repair verification.

11. BCM harness connector inspection

1) Inspect for poor connections at the BCM harness connector (pin 3 of C17). Is the connection status normal?

Refer to "LHD Body Control" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 with DPD)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Refer to "RHD Body Control (4JJ3 without DPD, RZ4E)" in the ETM (wiring diagram). (Open using the ETM viewer.).

Yes

=>Go to BCM replacement.

No

Repair the connections as necessary.

=>Go to Repair verification.

12. BCM replacement

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM removal".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM installation".

Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM setting".

Procedure completion

=>Go to Repair verification.

13. Repair verification

1) Connect all of the disconnected harness connectors.

2) Connect the scan tool.

3) Turn ON the ignition switch.

4) Operate the gearshift lever (MT models) or selector lever (AT models) to the R position.

5) Observe the Back Lamp Switch (M02-3) parameter on the scan tool. Does the Back Lamp Switch (M02-3) parameter change when the shift lever is operated?

Yes

The system is normal.

No

=>Go to Back up light switch signal check.