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The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following. NOTE: Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A Troubleshooting , and the communication circuit self- diagnostic function test. 1. Turn the ignition switch OFF, and then ON (II). 2. Press and hold the OFF button. While holding the OFF button, press the recirculation button five times within 10 seconds . Release the OFF button, then the self-diagnostic begins. Wait for about one minute for the self- diagnostic to complete. NOTE: The blower motor will run various speeds regardless of what the panel is displaying. If there is any problem in the system, the temperature indicator will light up the segment (A through Ohm) corresponding to the error. The temperature indicator will then alternate every second between displaying “88″ (all segments lit) and the error code segment (A through Q). To determine the meaning of the DTC, refer to checking for DTCs.

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The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following. NOTE: Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A Troubleshooting , and the communication circuit self- diagnostic function test. 1. Turn the ignition switch OFF, and then ON (II). 2. Press and hold the OFF button. While holding the OFF button, press the recirculation button five times within 10 seconds . Release the OFF button, then the self-diagnostic begins. Wait for about one minute for the self- diagnostic to complete. NOTE: The blower motor will run various speeds regardless of what the panel is displaying. If there is any problem in the system, the temperature indicator will light up the segment (A through Ohm) corresponding to the error. The temperature indicator will then alternate every second between displaying “88″ (all segments lit) and the error code segment (A through Q). To determine the meaning of the DTC, refer to checking for DTCs.

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Service Engine Soon (SES) Light On, Diagnostic Trouble Code (DTC) P0741, Torque Converter Clutch (TCC) Excessive Slip, Transaxle Chuggle, Slip/Surge (Inspect and/or Replace Various Internal Transaxle Components) 1998-2002 Cadillac Eldorado 1998-2004 Cadillac Seville 1999-2004 Cadillac DeVille 2000-2003 Oldsmobile Aurora with 4T80-E Auto Transaxle (RPO MH1) Some customer may comment on the SES light on and a chuggle or surge. Diagnostics may show excessive TCC slip speed and DTC P0741 will be current code Seal damage may allow the TCC apply fluid to leak into the channel plate, causing excessive TCC slippage under certain conditions, eventually causing no TCC apply.

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REMOVAL Wheels must be in a straight forward position and the key must be in the Lock position when removing or installing column to ensure proper alignment of components during installation. 1. Remove inflator module as outlined in Air Bag. Refer to Air Bags and Seat Belts/Air Bags(SRS). 2. Remove knee bolster and steering column reinforcement plate. 3. Disconnect electrical connectors from column. 4. Remove pinch bolt from intermediate shaft, Fig. 13. 5. Remove lower support bracket from vehicle. 6. Remove upper column support from instrument panel, then the column from vehicle. INSTALLATION 1. Install column in vehicle and support at upper bracket with two bolts, Fig. 14, do not tighten at this time. 2. Install column lower support bracket in vehicle, do not tighten at this time. 3. Connect column intermediate shaft to steering rack, install pinch bolt and torque to 35 ft. lbs. 1994 Cadillac Seville SLS V8-4.6L VIN Y 4. 5. 6. 7. Torque upper and lower column support bolts to 20 ft. lbs., then the lower bracket to column screws to 12 ft. lbs. Connect electrical connectors to column. Install knee bolster and column reinforcement plate. Install steering wheel inflator module as outlined in Air Bag. Refer to Air Bags and Seat Belts/Air Bags(SRS).

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Dual Electronic Automatic Temperature Control (DATC) Module Diagnostic Trouble Codes — DTCs If using the scan tool or front panel diagnostics to check for DATC DTCs: 1. Check continuous DTCs. 2. Run DATC self-test. Refer to Front Panel DATC Self-Test (On-demand Diagnostic Trouble Codes — DTCs). General Information: If the DTC is continuous only and does not appear in the self-test, this indicates an intermittent fault condition, such as a poor wiring connection or a loose terminal. If the DATC does not appear after running the self-test it may also indicate that the DTC may no longer exist. If the DTC is continuous and appears in the self-test, this indicates a hard fault. A hard fault suggests a permanent wiring failure, disconnected connector or component failure. Front Panel DATC Module Self-Test (On-Demand Diagnostic Trouble Codes — DTCs) On-demand DTCs are those that are reported by an ECU when a failure is detected while executing a diagnostic test. For the DATC module this means that all faults (hard) that occur while the module is conducting a self-test shall be reported as an on-demand DTC. The DATC module self-test will not detect concerns associated with data link messages such as engine coolant temperature or vehicle speed signals. The scan tool must be used to retrieve these concerns. The vehicle interior temperature should be between 0-32°C (32-90°F) when carrying out the self-test. I f the temperatures are not within the specified ranges, false temperature sensor DTCs may be displayed. The DATC module self-test through the front panel display: can be initiated at any time. Normal operation of the system stops when the self-test is activated. is entered by pressing the OFF and DEFROST buttons simultaneously and then pressing the AUTO button within two seconds. Record all DTCs displayed. concludes by reporting all on-demand DTCs. Follow the diagnostics procedure given under ACTION in the DTC index for each DTC given. reports individual on-demand DTCs as four-digit DTCs (less the alpha character). will calibrate all the mode doors and check all analog inputs. The DATC module will only report on-demand (hard) faults that occurred while the DATC module was conducting its self- test. will light all control panel display segments if no faults are detected. will report individual on-demand DTCs without the °C symbol lit.