Steering Column Tilt_Telescoping Malfunction

Steering Column Tilt/Telescoping Malfunction Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Diagnostic Fault Information

	Circuit	Circuit Function	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performan	ce
	4640	B+	—	1	—	—
	2096	Signal	C1159 49, 4	2	C1159 49, 4	—
	2097	Signal	C1159 49, 4	2	C1159 49, 4	—
	2094	Signal	C1159 49, 5	3	C1159 49, 5	—
	2095	Signal	C1159 49, 5	3	C1159 49, 5	—
	2111	Control	—	2	—	—
	2112	Control	—	2	—	—
	2110	Control	—	3	—	—
	2098	Control	—	3	—	—
	2154	Signal	C1159 49, 4	C1159 49, 4	C1159 49, 4	4
	2153	Signal	C1159 49, 5	C1159 49, 5	C1159 49, 5	5
	2157	Low Reference	—	C1159 49, 4	—	—
	2152	Low Reference	—	C1159 49, 5	—	—
	2020	Ground	—	1	—	—
	© 2023	General Moto	rs. All rights	reserved.

1850 Circuit	Ground Circuit Function	— Short to Ground	1 Open/High Resistance	— Short to Voltage	— Signal Performan
1. Column Tilt Wheel and Telescope Inoperative 2. Column Tilt Inoperative 3. Column Telescope Inoperative 4. Column Tilt Wheel Actuator Inoperative\Erratic 5. Column Telescope Actuator Inoperative\Erratic

Circuit/System Description The steering column has a tilt/telescoping control system that consists of a K99 Steering Column Tilt Wheel and Telescope Control Module capable of serial data communication, a steering column power assembly with positioning actuators and sensors, and a S71 Steering Column Tilt Wheel and Telescope Switch. The K99 Steering Column Tilt Wheel and Telescope Control Module will wake up either by the serial data or by the S71 Steering Column Tilt Wheel and Telescope Switch. Two position sensors are hall effect sensors and are used by the K99 Steering Column Tilt Wheel and Telescope Control Module. The K99 Steering Column Tilt Wheel and Telescope Control Module provides a 12 V reference voltage and a ground to both the tilt and telescoping position sensors. The sensor feedback circuit voltage varies from 0–12 V. Each sensor is part of the actuator assembly. The K99 Steering Column Tilt Wheel and Telescope Control Module monitors the feedback voltage to determine the column position. All DTCs and data from K99 Steering Column Tilt Wheel and Telescope Control Module is communicated through the serial data and stored in the K40D Driver Seat Adjuster Memory Module. Diagnostic Aids A bad hall effect will cause a tilt or telescope actuator to move for only .5 s. Reference Information Schematic Reference Tilt/Telescoping Steering Column Schematics Connector End View Reference Master Electrical Component List Description and Operation Steering Wheel and Column Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Circuit/System Verification

1. Ignition ON.
2. Verify the scan tool Steering Column Direction Switch parameter changes between Inactive, Forward, Rearward, Up, and Down when exercising the S71 Steering Column Tilt Wheel and Telescope Switch. ⇒ If the parameter does not change Refer to Circuit/System Testing – Switch Malfunction. ⇓ If the parameter changes

Note

Operate the steering column switch in each direction for more than 1 s.

Note

When performing the following tests, make sure that the steering column is not already in the position the test is attempting to produce.

3. Verify the steering column directional actuators listed below operate while operating the S71 Steering Column Tilt Wheel and Telescope Switch in all directions. M65 Steering Column Telescope Actuator M68 Steering Column Tilt Wheel Actuator ⇒ If the M65 Steering Column Telescope Actuator moves for only .5 s FORWARD or REARWARD 3.1. Wait 5 s. 3.2. Operate the S71 Steering Column Tilt Wheel and Telescope Switch FORWARD and REARWARD. ⇒ If the M65 Steering Column Telescope Actuator moves for only .5 s FORWARD or REARWARD, replace the M65 Steering Column Telescope Actuator ⇒ If the M65 Steering Column Telescope Actuator does not operate FORWARD and REARWARD Refer to Circuit/System Testing – Telescope Actuator Malfunction ⇒ If the M68 Steering Column Tilt Wheel Actuator moves for only .5 s UP and DOWN 3.1. Wait 5 s. 3.2. Operate the S71 Steering Column Tilt Wheel and Telescope Switch UP and DOWN. ⇒ If the M68 Steering Column Tilt Wheel Actuator moves for only .5 s UP or DOWN, replace the M68 Steering Column Tilt Wheel Actuator. ⇒ If the M68 Steering Column Tilt Wheel Actuator does not operate UP and DOWN Refer to Circuit/System Testing – Tilt Wheel Actuator Malfunction ⇒ If both the M65 Steering Column Telescope Actuator and the M68 Steering Column Tilt Wheel Actuator do not operate in any direction Refer to Circuit/System Testing – Steering Column Tilt Wheel Actuator and Telescope Actuator Control Circuit Test. ⇓ If both the M65 Steering Column Telescope Actuator and the M68 Steering Column Tilt Wheel Actuator operate
4. All OK. Circuit/System Testing Switch Malfunction
5. Ignition OFF, disconnect the connector at the S71 Steering Column Tilt Wheel and Telescope Switch. It may take up to 2 min for all vehicle systems to power down.
6. Test for less than 10 Ω between the low reference circuit terminal G and ground. ⇒ If 10 Ω or greater 2.1. Ignition OFF. 2.2. Test for less than 2 Ω in the ground circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K99 Steering Column Tilt Wheel and Telescope Control Module. ⇓ If less than 10 Ω
7. Ignition ON.
8. Test for B+ between the signal circuit terminals listed below and ground: Terminal A Terminal B Terminal C Terminal F ⇒ If less than B+ 4.1. Ignition OFF, disconnect the X1 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module. 4.2. Test for infinite resistance between the signal circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 4.3. Test for less than 2 Ω in the signal circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K99 Steering Column Tilt Wheel and Telescope Control Module. ⇓ If B+
9. Ignition OFF, disconnect the X1 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module. It may take up to 2 min for all vehicle systems to power down.
10. Ignition ON.
11. Test for less than 1 V between the signal circuit terminals listed below and ground: Terminal A Terminal B Terminal C Terminal F ⇒ If greater than 1 V Repair the short to voltage on the circuit ⇓ If less than 1 V
12. Test or replace the S71 Steering Column Tilt Wheel and Telescope Switch. Telescope Actuator Malfunction
13. Ignition OFF, disconnect the X2 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module, ignition ON.
14. Test for less than 1 V between each circuit terminal listed below and ground at the K99 Steering Column Tilt Wheel and Telescope Control Module harness connector. Steering Column Telescope Actuator Forward - terminal 7 Steering Column Telescope Actuator Rearward - terminal 8 Steering Column Telescope Actuator Signal - terminal 1 ⇒ If 1 V or greater Repair the short to voltage on the circuit. ⇓ If less than 1 V
15. Ignition OFF.
16. Test for infinite resistance between each circuit terminal listed below and ground at the K99 Steering Column Tilt Wheel and Telescope Control Module harness connector. Steering Column Telescope Actuator Forward - terminal 7 Steering Column Telescope Actuator Rearward - terminal 8 Steering Column Telescope Actuator Signal - terminal 1 ⇒ If less than infinite resistance Repair the short to ground on the circuit. ⇓ If Infinite resistance
17. Replace the M65 Steering Column Telescope Actuator. Tilt Wheel Actuator Malfunction
18. Ignition OFF, disconnect the X2 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module, ignition ON.
19. Test for less than 1 V between each circuit terminal listed below and ground at the K99 Steering Column Tilt Wheel and Telescope Control Module harness connector. Steering Column Tilt Wheel Actuator Down Control - terminal 9 Steering Column Tilt Wheel Actuator Up Control - terminal 10 Steering Column Tilt Wheel Actuator Signal - terminal 3 ⇒ If 1 V or greater Repair the short to voltage on the circuit. ⇓ If less than 1 V
20. Ignition OFF.
21. Test for infinite resistance between each circuit terminal listed below and ground at the K99 Steering Column Tilt Wheel and Telescope Control Module harness connector. Steering Column Tilt Wheel Actuator Down Control - terminal 9 Steering Column Tilt Wheel Actuator Up Control - terminal 10 Steering Column Tilt Wheel Actuator Signal - terminal 3 ⇒ If less than infinite resistance Repair the short to ground on the circuit. ⇓ If Infinite resistance
22. Replace the M68 Steering Column Tilt Wheel Actuator. Steering Column Tilt Wheel Actuator and Telescope Actuator Control Circuit Test
23. Ignition OFF and all vehicle systems OFF, disconnect the X1 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module. It may take up to 2 min for all vehicle systems to power down.
24. Test for less than 10 Ω between the ground circuit terminal 8 and ground. ⇒ If 10 Ω or greater 2.1. Ignition OFF. 2.2. Test for less than 2 Ω in the ground circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, repair the open/high resistance in the ground connection. ⇓ If less than 10 Ω
25. Ignition ON.
26. Verify a test lamp illuminates between the B+ circuit terminal 7 and ground. ⇒ If the test lamp does not illuminate and the circuit fuse is good 4.1. Ignition OFF. 4.2. Test for less than 2 Ω in the B+ circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. ⇒ If the test lamp does not illuminate and the circuit fuse is open 4.1. Ignition OFF. 4.2. Test for infinite resistance between the B+ circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the K99 Steering Column Tilt Wheel and Telescope Control Module. ⇓ If the test lamp illuminates
27. Ignition OFF, connect the X1 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module. Disconnect the connector at the S71 Steering Column Tilt Wheel and Telescope Switch.
28. Test for less than 10 Ω between the ground circuit terminal G and ground. ⇒ If 10 Ω or greater 6.1. Ignition OFF. 6.2. Test for less than 2 Ω in the ground circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K99 Steering Column Tilt Wheel and Telescope Control Module. ⇓ If less than 10 Ω
29. Replace the K99 Steering Column Tilt Wheel and Telescope Control Module. Component Testing Steering Column Tilt Wheel and Telescope Switch Test
30. Ignition OFF, disconnect the connector at the S71 Steering Column Tilt Wheel and Telescope Switch.
31. Test for infinite resistance between the ground circuit terminal G and each signal circuit terminal with the S71 Steering Column Tilt Wheel and Telescope Switch in the released position. ⇒ If less than infinite resistance Replace the S71 Steering Column Tilt Wheel and Telescope Switch. ⇓ If infinite resistance
32. Test for less than 2 Ω between the ground circuit terminal G and each signal circuit terminal with the S71 Steering Column Tilt Wheel and Telescope Switch in the pressed position. ⇒ If 2 Ω or greater Replace the S71 Steering Column Tilt Wheel and Telescope Switch. ⇓ If less than 2 Ω
33. All OK. Steering Column Telescope Actuator Test
34. Ignition OFF, disconnect the X2 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module.
35. Test for 1–2.5 Ω between terminal 7 and terminal 8. ⇒ If not within the specified range Replace the M65 Steering Column Telescope Actuator. ⇓ If within the specified range
36. All OK. Steering Column Tilt Wheel Actuator Test
37. Ignition OFF, disconnect the X2 connector at the K99 Steering Column Tilt Wheel and Telescope Control Module.
38. Test for 1–2.5 Ω between terminal 9 and terminal 10. ⇒ If not within the specified range Replace the M68 Steering Column Tilt Wheel Actuator. ⇓ If within the specified range
39. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Steering Column Tilt Wheel and Telescope Switch Replacement Control Module References for control module replacement, programming and setup.