DTC B1602

id0902a6808100

Detection Condition

• The PCM cannot read key ID number data normally.

Possible Cause

• Transponder (key) malfunction

• Coil malfunction

• PCM malfunction

• Communication error

Note
• Large metallic objects, electronic devices on the key chain, or a second key on the same key ring as the immobilizer system ignition key may cause vehicle starting concerns and record DTCs under certain conditions. If a fault cannot be identified, examine the customer's key ring for such objects or devices. If present, inform the customer that they need to keep these objects from touching the immobilizer system ignition key while starting the engine. These objects and devices cannot damage the immobilizer system ignition key, but can cause a momentary problem if they are too close to the key during engine start. If a problem occurs, turn the ignition switch off and restart the engine with all other objects on the key ring held away from the ignition key. Verify that the encoded ignition key used by the customer is an encoded ignition key.

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
VERIFY WHETHER KEY IS VALID OR NOT
• Using another programmed key, turn the ignition switch to the ON position.
• If there is not another programmed key, program an additional key using the WDS or equivalent and turn the ignition key to the ON position using the programmed key.
• Using the WDS or equivalent, verify if any DTCs are displayed.
- Is DTC B1602 displayed again?
Yes
Replace the coil antenna, then go to the next step.
No
• Dispose of the malfunctioning key.
• Program a new key if necessary.
2
Inspect the PCM.
• Using another programmed key, turn the ignition switch to the ON position.
• Using the WDS or equivalent, verify if any DTCs are displayed.
- Is DTC B1602 displayed again?
Yes
Replace the PCM and perform the resetting procedure for the immobilizer system when replacing the PCM.
No
DTC inspection completed.