Combination switch circuit system check (BCM)

1. Body control system check

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

2. Combination switch harness connector inspection

1) Inspect for poor connections at the combination switch harness connectors (B32, B36, and B37). 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 Combination switch signal input check.

No

Repair the connections as necessary.

=>Go to Repair verification.

3. Combination switch signal input check

1) Turn ON the ignition switch.

2) Operate the following switches.

  • Turn signal light switch
  • Light control switch
  • Windshield wiper switch
  • Windshield washer switch

3) Observe the following switch parameters on the scan tool. Does each switch parameter match the switch operation?

  • Right Turn Switch (M01-28), Left Turn Switch (M01-27)
  • Head Lamp Switch (M01-11)
  • Tail Lamp Switch (M01-10)
  • Hi Beam Switch (M01-14)
  • Passing Switch (M01-13)
  • Rear Fog Switch (M01-15)
  • Front Washer Switch (M01-1)
  • Front Wiper Lo Switch (M01-26), Front Wiper Hi Switch (M01-25), Front Wiper Auto/INT Switch (M01-24)

Yes

The system is normal.

No

=>Go to Combination switch inspection.

4. Combination switch inspection

1) Inspect the combination switch. Is the result normal?

Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch inspection".

Yes

Note

  • Perform the following inspections only for the circuits related to the switch whose operations do not match the scan tool parameter during "Combination switch signal input check".

=>Go to Inspection for open circuit and short circuit in turn signal light switch signal circuit.

No

Replace the combination switch.

Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch removal".

Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch installation".

=>Go to Repair verification.

5. Inspection for open circuit and short circuit in turn signal light switch signal circuit

1) Inspect the turn signal light switch right side or left side signal circuit between the BCM (pins 27 and 28 of B16) and the combination switch (pins 19 and 20 of B32) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in light control switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

6. Inspection for open circuit and short circuit in light control switch signal circuit

1) Inspect the light control switch signal circuit between the BCM (pin 11 of B16) and the combination switch (pin 12 of B32) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in taillight switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

7. Inspection for open circuit and short circuit in taillight switch signal circuit

1) Inspect the taillight switch signal circuit between the BCM (pin 10 of B16) and the combination switch (pin 13 of B32) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in high beam switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

8. Inspection for open circuit and short circuit in high beam switch signal circuit

1) Inspect the high beam switch signal circuit between the BCM (pin 14 of B16) and the combination switch (pin 17 of B32) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in passing switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

9. Inspection for open circuit and short circuit in passing switch signal circuit

1) Inspect the passing switch signal circuit between the BCM (pin 13 of B16) and the combination switch (pin 14 of B32) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in rear fog light switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

10. Inspection for open circuit and short circuit in rear fog light switch signal circuit

1) Inspect the rear fog light switch signal circuit between the BCM (pin 15 of B16) and the fog light switch (pin 7 of B32) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in windshield washer switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

11. Inspection for open circuit and short circuit in windshield washer switch signal circuit

1) Inspect the windshield washer switch signal circuit between the BCM (pin 1 of B16) and the combination switch (pin 4 of B37) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in windshield wiper switch signal circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

12. Inspection for open circuit and short circuit in windshield wiper switch signal circuit

1) Inspect the windshield wiper switch signal circuit between the BCM (pins 24, 25, and 26 of B16) and the combination switch (pins 1, 2, and 7 of B36) for the following. Is the result normal?

  • Open circuit
  • High resistance
  • Short to ground
  • Short to another circuit

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 and short circuit in windshield wiper switch power supply circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

13. Inspection for open circuit and short circuit in windshield wiper switch power supply circuit

1) Inspect the windshield wiper switch power supply circuit between the FRT WIPER 20A fuse and the combination switch (pin 3 of B36) 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.).

Yes

=>Go to Inspection for open circuit in combination switch ground circuit.

No

Repair the circuit as necessary.

=>Go to Repair verification.

14. Inspection for open circuit in combination switch ground circuit

1) Inspect the ground circuit between the combination switch (pin 16 of B32, pin 6 of B36, and pin 7 of B37) and the frame ground for the following. Is the result normal?

  • Open circuit
  • High resistance

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.

15. BCM harness connector inspection

1) Inspect for poor connections at the BCM harness connector (pins 1, 10, 11, 13, 14, 24, 25, 26, 27, and 28 of B16). 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.

16. BCM replacement

Note

  • Perform programming after replacing the BCM.

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.

17. Repair verification

1) Connect all of the disconnected harness connectors.

2) Connect the scan tool.

3) Turn ON the ignition switch.

4) Operate the following switches.

  • Turn signal light switch
  • Light control switch
  • Windshield wiper switch
  • Windshield washer switch

5) Observe the following switch parameters on the scan tool. Does each switch parameter match the switch operation?

  • Right Turn Switch (M01-28), Left Turn Switch (M01-27)
  • Head Lamp Switch (M01-11)
  • Tail Lamp Switch (M01-10)
  • Hi Beam Switch (M01-14)
  • Passing Switch (M01-13)
  • Rear Fog Switch (M01-15)
  • Front Washer Switch (M01-1)
  • Front Wiper Lo Switch (M01-26), Front Wiper Hi Switch (M01-25), Front Wiper Auto/INT Switch (M01-24)

Yes

The system is normal.

No

=>Go to Combination switch harness connector inspection.

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