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B2593
The BCM provides the steering column control function which allows the column to be electronically locked or unlocked. The BCM provides two outputs, column lock drive (A) and column unlock drive (B) and a steering column lock relay control output. The BCM can apply a ground or battery output on the column lock drive (A) CKT 1603 or column unlock drive (B) CKT 1604 depending on the desired steering column lock motor position. The BCM uses the feedback switch in order to monitor the motor position and determine if the commanded position was accomplished.
The BCM controls the position of the steering column lock motor based on the following input information:
• Ignition position
• Key IN ignition status
• Key OUT of ignition status
• Steering column lock feedback switch
• PASS-Key® system
• PCM password information
• System voltage
The BCM also monitors its circuitry for the column lock drive (A) circuit. If the BCM detects a malfunction present a DTC will set.
Conditions for Setting the DTC
• The BCM detects an internal malfunction (an open or a short to voltage) in the column lock drive (B) circuit.
• There is an open in the BCM ground CKT 150.
• The condition must be present for 100 ms.
Action Taken When the DTC Sets
• Stores a DTC B2593 in the BCM memory.
• The PCM may disable fuel if vehicle speed is detected over 2.4 km/h (1.5 mph).
• Sends a message to the IPC to display the SERVICE COLUMN LOCK message.
Conditions for Clearing the DTC
• The BCM no longer detects an internal malfunction (an open or a short to voltage) in the column lock drive (B) circuit.
• There is no longer an open in the BCM ground CKT 150.
• A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
• Use the IPC clearing DTCs feature.
• Use a scan tool.
Diagnostic Aids
• The BCM grounds the steering column lock motor through CKT 150. If the BCM is unable to ground steering column lock motor through CKT 150, the BCM will set a DTC B2588.
• Disconnecting the steering column connector C207 with the ignition in the ON position will cause the BCM to enter a Fail Enable Standby mode. The steering column will remain inoperative until the Fail Enable Standby mode is cleared. To clear this mode, disconnect the BCM fuse #25 for 15 seconds.
• If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur.
B2588
The BCM provides the steering column control function which allows the column to be electronically locked or unlocked. The BCM provides two outputs, column lock drive (A) and column unlock drive (B) and a steering column lock relay control output. The BCM can apply a ground or battery output on the column lock drive (A) CKT 1603 or column unlock drive (B) CKT 1604 depending on the desired steering column lock motor position. The BCM uses the feedback switch in order to monitor the motor position and determine if the commanded position was accomplished.
The BCM controls the position of the steering column lock motor based on the following input information:
• Ignition position
• Key IN ignition status
• Key OUT of ignition status
• Steering column lock feedback switch
• PASS-Key® system
• PCM password information
• System voltage
The BCM also monitors its circuitry for the column lock drive (A) circuit. If the BCM detects a malfunction present a DTC will set.
Conditions for Setting the DTC
• The BCM detects an internal malfunction (an open or a short to voltage) in the column lock drive (A) circuit.
• There is an open in the BCM ground CKT 150.
• The condition must be present for 100 ms.
Action Taken When the DTC Sets
• Stores a DTC B2588 in the BCM memory.
• The PCM may disable fuel if vehicle speed is detected over 2.4 km/h (1.5 mph).
• Sends a message to the IPC to display the SERVICE COLUMN LOCK message.
Conditions for Clearing the DTC
• The BCM no longer detects an internal malfunction (an open or a short to voltage) in the column lock drive (A) circuit.
• There is no longer an open in the BCM ground CKT 150.
• A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
• Use the IPC clearing DTCs feature.
• Use a scan tool.
Diagnostic Aids
• The BCM grounds the steering column lock motor through CKT 150. If the BCM is unable to ground steering column lock motor through CKT 150, the BCM will set a DTC B2588.
• Disconnecting the steering column connector C207 with the ignition in the ON position will cause the BCM to enter a Fail Enable Standby mode. The steering column will remain inoperative until the Fail Enable Standby mode is cleared. To clear this mode, disconnect the BCM fuse #25 for 15 seconds.
• If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur.
B2583
The BCM monitors the LF turn signal circuit in order to determine the status of the turn signal switch. If the BCM detects an oscillating voltage on CKT 14, the BCM interprets this as a LF turn signal ON request from the turn signal switch. The BCM will de-energize the LH DRL relay, which will disable the LF turn signal lamp (which is ON for the DRL), thus allowing the LF turn signal to flash. If the BCM does not detect an oscillating voltage on CKT 14, the BCM interprets this as the LF turn signal being OFF. The BCM will then energize the LH DRL relay and continue normal DRL operation. The BCM monitors the LF turn signal CKT 14 and determines how long voltage is applied. If the voltage is applied for longer than expected, a malfunction is present and a DTC will set.
Conditions for Setting the DTC
• The BCM detects continuous battery voltage on the LF turn signal monitor circuit (CKT 14).
• The condition must be present for longer than 5 seconds.
Action Taken When the DTC Sets
• Stores a DTC B2583 in the BCM memory.
• No driver warning message will be displayed for this DTC.
Conditions for Clearing the DTC
• This DTC requires an ignition cycle in order to change from current to history.
• The BCM no longer detects continuous battery voltage on the LF turn signal monitor circuit (CKT 14) for longer than 5 seconds.
• A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
• Use the IPC clearing DTCs feature.
• Use a scan tool.
Diagnostic Aids
• The following conditions may cause an intermittent malfunction:
o There is an intermittent short to voltage in CKT 14, CKT 16, or CKT 1314.
o The turn signal switch or the hazard switch is shorted internally or is sticking.
• The BCM needs to detect voltage oscillations on CKT 14 in order to de-energize the LF DRL relay. If the BCM detects continuous voltage on CKT 14, the BCM interprets this as a short to voltage. The BCM will continue with normal DRL operation, and the LF turn signal will remain inoperative.
• If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections Diagnosis .
B2578
The BCM monitors the RF turn signal circuit in order to determine the status of the turn signal switch. If the BCM detects an oscillating voltage on CKT 15, the BCM interprets this as a RF turn signal ON request from the turn signal switch. The BCM will de-energize the RH DRL relay, which will disable the RF turn signal lamp (which is ON for the DRL), thus allowing the RF turn signal to flash. If the BCM does not detect an oscillating voltage on CKT 15, the BCM interprets this as the RF turn signal being OFF. The BCM will then energize the RH DRL relay and continue normal DRL operation. The BCM monitors the RF turn signal CKT 15 and determines how long voltage is applied. If the voltage is applied for longer than expected, a malfunction is present and a DTC will set.
Conditions for Setting the DTC
• The BCM detects continuous battery voltage on the RF turn signal monitor circuit (CK 15).
• The condition must be present for longer than 5 seconds.
Action Taken When the DTC Sets
• Stores a DTC B2578 in the BCM memory.
• No driver warning message will be displayed for this DTC.
Conditions for Clearing the DTC
• This DTC requires an ignition cycle in order to change from current to history.
• The BCM no longer detects continuous battery voltage on the RF turn signal monitor circuit (CKT 15) for longer than 5 seconds.
• A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
• Use the IPC clearing DTCs feature.
• Use a scan tool.
Diagnostic Aids
• The following conditions may cause an intermittent malfunction:
o There is an intermittent short to voltage in CKT 15, CKT 16, or CKT 1315.
o The turn signal switch or the hazard switch is internally shorted or is sticking.
• The BCM needs to detect voltage oscillations on CKT 15 in order to de-energize the RF DRL relay. If the BCM detects continuous voltage on CKT 15, the BCM interprets this as a short to voltage. The BCM will continue with normal DRL operation, and the RF turn signal will remain inoperative.
If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections Diagnosis
