B2512

DTC 2512 Strng Wheel Controls Illegal A/D Values:

CIRCUIT DESCRIPTION
Eight steering wheel control switches are used to control tour audio and tour HVAC functions. When the vehicle is equipped with the cellular telephone option, four telephone switches take the place of the HVAC steering wheel controls. The steering wheel controls are configured as a resistive ladder network connected to the Dash Integration Module (DIM) across connector C1 terminal B3 and connector C2 terminal A1. When the vehicle is in ON, ACCY or RAP, battery voltage is provided from the DIM on CKT 1796 (DK BLU) to the steering wheel controls. Pressing a switch (or switches) causes a voltage to appear on return CKT 1375 (PPL) which has a value unique to the switch(es) pressed.

CONDITIONS FOR SETTING DTC
^ DTC B2512 only sets it B1328 or B1327 is not current in DIM memory.
^ DTC B2512 sets if the DIM determines that an illegal voltage value appears on the steering wheel controls CKT 1796 (DK BLU) input to the DIM. (The legal voltage values, which are stored in the DIM for comparison to the actual values, consist of all possible voltage values input to the DIM through the switch resistance ladder network for all possible switch combinations pressed. The DIM also takes into account fluctuations in the voltage level of the feed CKT 1375 (PPL) voltage to the steering wheel control switches when it determines the switch return voltage value.)

ACTION TAKEN WHEN THE DTC SETS
^ DTC B2512 is stored in the DIM memory.
^ The module disables the steering wheel control functions as long as this DTC is current.
^ A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ This DTC does not cause a driver warning message to appear.

CONDITIONS FOR CLEARING DTC
^ A current DTC clears (status changes from current to history) if the conditions which caused the DTC to set are no longer present.
^ Current and history DTCs may be cleared using a scan tool or using the IPC on-board clearing DTCs feature.

DIAGNOSTIC AIDS
Refer to Steering Wheel Controls in Entertainment for additional information about this system.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
1. Perform the Body Control Module Diagnostic System Check before continuing with the diagnosis of this DTC.
2. Clear all DTCs and cycle ignition to check that the DTC did not erroneously set.
8. Clear all DTCs after the repair procedure is complete.