Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR DTC B1D56-ADJUSTABLE PEDAL SENSOR CIRCUIT LOW
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.

With the scan tool, record and erase DTC's.

Cycle the ignition switch from off to on.

Cycle the Adjustable Pedals Switch forward and rearward.

With the scan tool, read DTC's

Does the scan tool display: B1D56-ADJUSTABLE PEDAL SENSOR CIRCUIT LOW?

Yes
1. Go To step 2).
No
1. Refer to APS-INTERMITTENT CONDITION .
2. Perform APS VERIFICATION TEST - VER 1 .
2) CHECK CONNECTOR/TERMINAL FOR DAMAGE
NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals.

Turn the ignition off.

Inspect the Memory Seat Module harness connector and Adjustable Pedals Motor harness connector.

Is there any connector or terminal damaged?

Yes
1. Repair as necessary.
2. Perform APS VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) CHECK ADJUSTABLE PEDALS SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking Adjustable Pedals Sensor Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Memory Seat Module harness connector.

Disconnect the Adjustable Pedals Motor harness connector.

Using a 12-volt test light connected to 12-volts, probe the Adjustable Pedals Sensor Supply circuit.

Does the test light illuminate brightly?

Yes
1. Repair the Adjustable Pedals Sensor Supply circuit for a short to ground.
2. Perform APS VERIFICATION TEST - VER 1 .
No
1. Go To step 4).
4) CHECK ADJUSTABLE PEDALS SENSOR SUPPLY CIRCUIT FOR AN OPEN

Fig 2: Checking Adjustable Pedals Sensor Supply Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Connect a jumper wire between the Adjustable Pedals Sensor Supply circuit and ground at the Memory Seat Module harness connector.

Using a 12-volt test light connected to 12-volts, probe the Adjustable Pedals Sensor Supply circuit.

Does the test light illuminate brightly

Yes
1. Go To step 5).
No
1. Repair the Adjustable Pedals Sensor Supply circuit for an open.
2. Perform APS VERIFICATION TEST - VER 1 .
5) CHECK ADJUSTABLE PEDALS SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking Adjustable Pedals Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Using a 12-volt test light connected to 12-volts, probe the Adjustable Pedals Sensor Signal circuit.

Does the test light illuminate brightly?

Yes
1. Repair the Adjustable Pedals Sensor Signal circuit for a short to ground.
2. Perform APS VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) CHECK ADJUSTABLE PEDALS SENSOR SIGNAL CIRCUIT FOR AN OPEN

Fig 4: Checking Adjustable Pedals Sensor Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Connect a jumper wire between the Adjustable Pedals Sensor Signal circuit and ground at the Memory Seat Module harness connector.

Using a 12-volt test light connected to 12-volts, probe the Adjustable Pedals Sensor Signal circuit.

Does the test light illuminate brightly?

Yes
1. Go To step 7).
No
1. Repair the Adjustable Pedals Sensor Signal circuit for an open.
2. Perform APS VERIFICATION TEST - VER 1 .
7) CHECK ADJUSTABLE PEDALS SENSOR SUPPLY CIRCUIT VOLTAGE
Connect the Memory Seat Module harness connector.

Turn the ignition on.

Measure the voltage between the Adjustable Pedals Sensor Supply circuit and ground at the Adjustable Pedal Motor harness connector.

Is the voltage between 4.0 and 5.2 volts?

Yes
1. Go To step 8).
No
1. Replace and reprogram the Memory Seat Module in accordance with the Service Information.
2. Perform APS VERIFICATION TEST - VER 1 .
8) CHECK ADJUSTABLE PEDALS SENSOR SIGNAL CIRCUIT VOLTAGE
Measure the voltage of the Adjustable Pedals Sensor Signal circuit in the Memory Seat Module harness connector.

Is the voltage above 0.5 volts?

Yes
1. Replace and reprogram the Memory Seat Module in accordance with the Service Information.
2. Perform APS VERIFICATION TEST - VER 1 .
No
1. Replace the Adjustable Pedals Sensor in accordance with the Service Information.
2. Perform APS VERIFICATION TEST - VER 1 .