[Z06] B0605H BCM Internal Memory Function?
Tech Contributor
Joined: Oct 1999
Posts: 41,030
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From: Charlotte, NC (formerly Endicott, NY)
Here is some diagnostic info:
DTC B0605
Circuit Description
The control module calibrations are stored in the EEPROM when the ignition switch is turned OFF. When the ignition is first turned ON, the control module performs internal tests on the EEPROM to determine the integrity of this non-volatile memory. The control module compares its previously stored checksum with the checksum calculated when the ignition is first turned ON. If the two checksums do not match, the control module will indicate a calibration malfunction (checksum error) is current and set this DTC.
Conditions for Setting the DTC
Action
Yes
No
Step 1
Perform the appropriate Diagnostic System Check for the system exhibiting symptoms.
Did you perform the Diagnostic System Check?
Go to Step 2
Go to Control Module References
Step 2
Is DTC received as a current DTC?
Go to Step 3
Go to Diagnostic Aids
Step 3
Important
Perform the control module programming/configuration procedure if required.
Replace the module. Refer to Control Module References .
Did you complete the replacement?
Go to Step 4
--
Step 4
Go to Step 2
System OK
Bill
DTC B0605
Circuit Description
The control module calibrations are stored in the EEPROM when the ignition switch is turned OFF. When the ignition is first turned ON, the control module performs internal tests on the EEPROM to determine the integrity of this non-volatile memory. The control module compares its previously stored checksum with the checksum calculated when the ignition is first turned ON. If the two checksums do not match, the control module will indicate a calibration malfunction (checksum error) is current and set this DTC.
Conditions for Setting the DTC
- The stored checksum does not match the calculated checksum.
- The condition must occur when the ignition is first turned ON.
- Stores a DTC B0605 in the BCM memory.
- No driver warning message will be displayed for this DTC.
- The control module operates based on the last calibration set stored when the ignition switch was turned OFF.
- This DTC requires an ignition cycle in order to change from current to history.
- The control module no longer detects an internal memory malfunction (checksum error).
- A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is not repeated.
- This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the control module.
- If this DTC is retrieved as both a current and history DTC, replace the module.
Action
Yes
No
Step 1
Perform the appropriate Diagnostic System Check for the system exhibiting symptoms.
Did you perform the Diagnostic System Check?
Go to Step 2
Go to Control Module References
Step 2
Is DTC received as a current DTC?
Go to Step 3
Go to Diagnostic Aids
Step 3
Important
Perform the control module programming/configuration procedure if required.
Replace the module. Refer to Control Module References .
Did you complete the replacement?
Go to Step 4
--
Step 4
- Use the scan tool in order to clear the DTCs.
- Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Go to Step 2
System OK
Bill
Last edited by Bill Dearborn; Nov 15, 2008 at 01:21 PM.
