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DTC P1615: Steering Lock Unit Communication Error (For Vehicle With Keyless Start System): Troubleshooting

TROUBLESHOOTING CHART

Step Action YES NO
1  Diagnostic Trouble Code (DTC) confirmation 
  1. Clear DTC(s) referring to DIAGNOSTIC TROUBLE CODE (DTC) CLEARANCE .
  2. Turn the ignition switch to OFF position.
  3. Check if any DTC is detected referring to DIAGNOSTIC TROUBLE CODE (DTC) CHECK .

Is DTC P1615 still detected? 		 Go to Step 2. The troubleshooting is completed.
2  Registration of the ignition key 
  1. Turn the ignition switch to OFF position.
  2. Turn the ignition switch to ON position, and register the transponder code in the transponder in the ignition key with ECM referring to REGISTRATION OF THE IGNITION KEY .

Was it possible to register the ignition key (transponder code) in ECM? 		 The troubleshooting is completed. Go to Step 3.
3  Diagnostic Trouble Code (DTC) check 
  1. Check if any DTC is detected referring to DIAGNOSTIC TROUBLE CODE (DTC) CHECK .

Is any DTC detected? 		 Go to Step 4. Replace ECM with a known-good one and recheck.
4  Diagnostic Trouble Code (DTC) check 
Is any DTC other than P1615 detected in Step 3? 		 Perform the troubleshooting. Refer to appropriate DTC diagnostics. Go to Step 5.
5  Steering lock unit check 
  1. Turn on the engine start knob of the keyless start system.

Is the engine start knob at ON position? 		 Replace the steering lock unit with a known-good one and recheck. Go to Step 6.
6  Steering lock unit operation check 
  1. Check the steering lock unit for operation referring to IGNITION SWITCH INSPECTION .

Does the engine start knob operate as specified? 		 Go to Step 7. Replace the steering lock unit referring to STEERING LOCK ASSEMBLY (IGNITION SWITCH) REMOVAL AND INSTALLATION .
7  Check for open in wire circuits between steering lock unit and keyless start control module 
  1. Disconnect steering lock unit connector "G22" and keyless start control module connector "G42".
  2. Measure resistance at the following connector terminals.
    • Between "G22-3" terminal of steering lock unit connector and "G42-20" terminal of keyless start control module connector.
    • Between "G22-7" terminal of steering lock unit connector and "G42-29" terminal of keyless start control module connector.
    • Between "G22-8" terminal of steering lock unit connector and "G42-30" terminal of keyless start control module connector.

Is each resistance 1 Ω or less? 		 Go to Step 8. Repair open or high resistance in faulty wire circuit.
8  Check for short of wire circuits between steering lock unit and keyless start control module 
  1. Measure resistance at the following connector terminals.
    • Between "G22-3", "G22-7" and "G22-8" terminal of steering lock unit connector.
    • Between "G42-20", "G42-29" and "G42-30" terminal of keyless start control module.

Is each resistance infinity? 		 Go to Step 9. Make sure of insulation of each wire circuit.
9  Check for short to ground wire circuit in wire circuits between steering lock unit and keyless start control module 
  1. Measure resistance at the following connector terminals.
    • Between "G22-3" terminal of steering lock unit connector and vehicle body ground.
    • Between "G22-7" terminal of steering lock unit connector and vehicle body ground.
    • Between "G22-8" terminal of steering lock unit connector and vehicle body ground.
    • Between "G42-20" terminal of keyless start control module connector and vehicle body ground.
    • Between "G42-29" terminal of keyless start control module connector and vehicle body ground.
    • Between "G42-30" terminal of keyless start control module connector and vehicle body ground.

Is each resistance infinity? 		 Go to Step 10. Repair short to ground wire circuit in malfunctioning wire circuit.
10  Check for short to power supply wire circuit in wire circuits between steering lock unit and keyless start control module 
  1. Measure voltage at the following connector terminals with ignition switch turned ON.
    • Between "G22-3" terminal of steering lock unit connector and vehicle body ground.
    • Between "G22-7" terminal of steering lock unit connector and vehicle body ground.
    • Between "G22-8" terminal of steering lock unit connector and vehicle body ground.
    • Between "G42-20" terminal of keyless start control module connector and vehicle body ground.
    • Between "G42-29" terminal of keyless start control module connector and vehicle body ground.
    • Between "G42-30" terminal of keyless start control module connector and vehicle body ground.

Is each voltage 0 - 1 V? 		 Replace keyless start control module with a known-good one and recheck. If DTC P1615 is still detected, replace ECM with a known-good one and recheck. Repair short to power supply wire circuit in malfunctioning wire circuit.
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