Automatic Transmission Shift Lock Control Always On with Ignition in Run. Cadillac Seville 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Seville 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T80-E 🢒 Automatic Transmission Shift Lock Control Always On with Ignition in Run

Step	Action	Value(s)	Yes	No
SCHEMATIC REFERENCE: Shift Interlock Actuator Control Automatic Transmission Components Automatic Transmission Shift Lock Control Circuit Description Reverse Lockout Actuator Control Handling ESD Sensitive Parts Notice Handling ESD Sensitive Parts Notice Class 2 Serial Data Line (RH Drive) DIM Ignition Inputs Ignition Switch Ignition Switch IGN SW, HTDST LR, HTDST RR, and HTDST RF Fuses NSBU, F/PMP, CVRTD and BODY Fuses G200 2 of 2 G200 2 of 2
1	Did you perform A Diagnostic System Check - Automatic Transmission Shift Lock Control?	--	Go to Step 2	Go to Diagnostic System Check - Automatic Transmission Shift Lock Control
2	Turn OFF the ignition. Block the wheels and apply the parking brake. Attempt to move the shift lever out of the PARK position. Does the shift lever move out of the PARK position?	--	Go to Step 3	Go to Step 5
3	Turn ON the ignition, with the engine OFF. Press and hold the brake pedal. Attempt to move the shift lever out of the PARK position. Does the shift lever move out of the PARK position?	--	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 4
4	Turn OFF the ignition. Disconnect the stoplamp/automatic transmission shift lock control switch. Turn ON the ignition, with the engine OFF. Attempt to shift the transmission out of Park. Does the transmission shift out of Park?	--	Go to Step 6	Go to Step 5
5	Turn OFF the ignition. Disconnect the shift interlock actuator. Turn the ignition ON, with the engine OFF. Connect a test lamp between the controlled positive voltage circuit of the automatic transmission shift lock control actuator and a good ground. Does the test lamp illuminate?	--	Go to Step 8	Go to Step 7
6	Important:: Inspect the stoplamp/automatic transmission shift lock control switch for proper adjustment. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes. Inspect for poor connections at the harness connector of the stoplamp/automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 11	Go to Step 9
7	Inspect for poor connections at the harness connector of the automatic transmission shift lock control actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	--	Go to Step 11	Go to Step 10
8	Repair the short to voltage in the controlled positive voltage circuit of the automatic transmission shift lock control actuator. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Step 11	--
9	Replace the stoplamp/automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the replacement?	--	Go to Step 11	--
10	Replace the automatic transmission shift lock control actuator. Refer to Park Lock Cable Replacement in Automatic Transaxle - 4T80-E. Did you complete the replacement?	--	Go to Step 11	--
11	Operate the vehicle in order to verify the repair. Did you correct the condition?	--	System OK	Go to Step 2

Shift Interlock Actuator Control