Circuit Description
The memory seat module monitors the locations of the adjustable pedals using position sensors mounted to the brake pedal and accelerator pedal assemblies. The position sensors are supplied with a 5-volt reference and ground circuits from the memory seat module. The position sensor signal circuits are referenced from ground within the memory seat module. The signal voltages monitored by the memory seat module range from 0.25-4.75 volts and are determined by the wiper locations on the resistors within the position sensors. The position sensor signal circuit voltage levels are used by the memory seat module to determine the positions of the adjustable pedals when storing or recalling memory position settings.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B3632 Adjustable Brake Pedal Position Sensor Circuit |
| • | DTC B3633 Adjustable Accelerator Pedal Position Sensor Circuit |
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
The position sensor signal circuit voltage level to the driver seat module is not within the 0.25-4.75 volt range.
Action Taken When the DTC Sets
The adjustable pedals system operation will be disabled.
Conditions for Clearing the DTC
| • | The DTC will be current for as long as the fault is present. |
| • | When the fault is no longer present the DTC will be a history status code. |
| • | The history DTC will be cleared after 50 error free ignition cycles, or by using the scan tool clearing DTCs feature. |
Diagnostic Aids
All of the position sensors monitored by the memory seat module are supplied with common 5-volt reference and ground circuits.
| • | If the 5-volt reference circuit is shorted to voltage multiple codes will set. |
| • | If the 5-volt reference circuit is shorted to ground multiple codes will set. |
| • | If the sensor ground circuit is open multiple codes will set. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Tests for the proper operation of the signal circuit in the low voltage range.
-
Tests for the proper operation of the signal circuit in the high voltage range.
-
Tests for a short to voltage in the 5-volt reference circuit.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Adjustable Pedal Schematics Connector End View Reference: Adjustable Pedal Connector End Views | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||
2 |
Is the Position Sensor parameter within the specified range? | 13-242 Counts | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||
Is the Position Sensor parameter less than the specified value? | 15 Counts | Go to Step 4 | Go to Step 8 | |||||||
Connect a 3-ampere fused jumper wire between the signal circuit terminal and the 5-volt reference circuit terminal. Is the Position Sensor parameter greater than the specified value? | 240 Counts | Go to Step 5 | Go to Step 7 | |||||||
Is the voltage greater than the specified value? | 5 V | Go to Step 6 | Go to Step 10 | |||||||
6 | Test the 5-volt reference circuit to the memory seat module for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||
7 | Test the 5-volt reference circuit to the memory seat module for one of the following conditions:
Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 9 | ||||||
8 | Test the signal circuit to the memory seat module for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||
9 | Test the signal circuit to the memory seat module for one of the following conditions:
Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | ||||||
10 | Test the low reference circuit to the memory seat module for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||
11 | Test the position sensor circuits in the IP harness for the following conditions:
Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 12 | ||||||
12 | Inspect for poor connections at the harness connector of the position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||
13 | Inspect for poor connections at the harness connector of the memory seat module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||
14 | Replace the appropriate pedal assembly. Refer to Brake Pedal Assembly Replacement or to Accelerator Pedal Assembly Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
15 | Replace the memory seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
16 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||
