Circuit Description
The memory seat module monitors the locations of the adjustable pedals using position sensors mounted to the brake and accelerator pedal actuators. 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. The memory seat module also monitors the locations of both pedal assemblies in order to prevent a step over condition from occurring. During manual or memory operation the position sensor inputs to the memory seat module must remain within 0.6 volts or 31 counts of each other. During a calibration procedure the position sensor inputs must not vary more than 0.3 volts or 23 counts.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3617 Adjustable Foot Pedal Position Sensor Circuit
Conditions for Running the DTC
The system voltage must be between 9.0-16.0 volts.
Conditions for Setting the DTC
The memory seat module determines that a step over condition between the brake and accelerator pedals may exist.
| • | During manual or memory operation the difference between the brake and accelerator pedal position sensor signals is greater than 31 counts. |
| • | During an attempted calibration procedure the difference between the brake and accelerator pedal position sensor signals is greater than 23 counts. |
Action Taken When the DTC Sets
The adjustable pedals system will be disabled.
Conditions for Clearing the DTC
This DTC will remain current until it is cleared, and may only be cleared by using the scan tool clearing DTCs feature.
Diagnostic Aids
| • | Inspect for poor connections at the position sensor electrical connectors. |
| • | Inspect the drive cables for damage and proper connections at the adjuster motor and pedal actuators. |
| • | Inspect the position sensors and pedal actuators for obvious damage which may cause the condition. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Verify that both pedal assemblies are in proper mechanical working order.
-
Verify that both position sensors are in proper mechanical working order.
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Attempt to manually synchronize the pedal assemblies to within acceptable limits.
Step | Action | 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 DTC B3632 or B3633 current or history? | Go to DTC B3632 or B3633 | Go to Step 3 |
Using a scan tool operate the pedals from the rearward stop to the forward stop. Refer to Scan Tool Output Controls . Do both pedals mechanically operate from the rearward stop to the forward stop? | Go to Step 4 | Go to Step 9 | |
Using a scan tool operate the pedals from the forward stop to the rearward stop while observing the Position Sensor parameters. Do both position sensor parameters change in continuous and incremental values? | Go to Step 5 | Go to Step 9 | |
5 | Do the brake and Accelerator Pedal Position sensor values remain within 31 counts of each other? | Go to Step 12 | Go to Step 6 |
Are the brake and accelerator pedal position sensor values within 23 counts of each other? | Go to Step 7 | Go to Step 9 | |
7 | Clear the DTC and perform the adjustable pedals calibration procedure from the scan tool special functions menu. Refer to Scan Tool Output Controls . Does the adjustable pedal system successfully complete the calibration procedure? | Go to Step 12 | Go to Step 8 |
8 | During the attempted calibration procedure did the brake and accelerator pedal position sensor values remain within 23 counts of each other? | Go to Step 10 | Go to Step 9 |
9 | Replace the appropriate cable or pedal assembly. Refer to Brake Pedal Assembly Replacement or to Accelerator Pedal Assembly Replacement . Is the repair complete? | Go to Step 12 | -- |
10 | Inspect for poor connections at the memory seat module. 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 12 | Go to Step 11 |
11 | Replace the memory seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the repair complete? | Go to Step 12 | -- |
12 |
Does the DTC reset? | Go to Step 2 | System OK |
