B1991

Pinpoint Tests





Pinpoint Tests

Pinpoint Test D: DTC B1987, B1991 or B2275

Refer to Wiring Diagram Set 127, Adjustable Pedals for schematic and connector information. Diagrams By Number

Normal Operation

The Driver Seat Module (DSM) uses a Hall-effect switch attached to the pedal motor to identify the current pedal position. The DSM (Driver Seat Module) sends a reference voltage along circuit LPP06 (YE/BU), through the Hall-effect switch and back to the DSM (Driver Seat Module) along the signal return circuit, RPP06 (GN).

When 1 or more of the following DTCs are set, the adjustable pedals will enter a "jog mode". When the pedals are in jog mode, the memory system recall will not function from either the Remote Keyless Entry (RKE) transmitter or the memory SET switch buttons. When the pedals are actuated using the adjustable pedal switch, the motor will move the pedals for one second in the direction selected regardless of the length of time the button is actually pressed.

- B1987 (Pedal Forward/Rearward Motor Stalled)- This DTC is only set during a DSM (Driver Seat Module) on-demand self test. During the self test, the adjustable pedal motor will be commanded to move forward and then rearward. If the motor encounters a hard stop while moving, the DSM (Driver Seat Module) will attempt to move the pedals in the opposite direction. If the DSM (Driver Seat Module) does not see any pedal movement via the Hall-effect switch during this attempt, DTC B1987 will be set and the adjustable pedal system will be disabled.

- B1991 (Pedal Forward/Rearward Potentiometer Feedback Circuit Short to Battery)- If the DSM (Driver Seat Module) detects a short to voltage on circuit LPP06 (YE/BU) during normal operation or an on-demand self test and without any pedal switch input, DTC B1991 will be set.

- B2275 (Pedal Forward/Rearward Potentiometer Feedback Circuit Short to Ground)- If the DSM (Driver Seat Module) detects a short to ground on circuit LPP06 (YE/BU) during normal operation or an on-demand self test and without any pedal switch input, DTC B2275 will be set.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Adjustable pedal motor

PINPOINT TEST D : DTC B1987, B1991 OR B2275

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

D1 CHECK THE DSM (Driver Seat Module) HALL-EFFECT CIRCUITS FOR AN OPEN

- Ignition OFF.

- Disconnect: Adjustable Pedal Motor C2003.

- Disconnect: DSM (Driver Seat Module) C341C.

- Measure the resistance between DSM (Driver Seat Module) C341C, harness side and adjustable pedal motor C2003, harness side as indicated in the following chart:

DSM (Driver Seat Module) Circuit Adjustable Pedal Motor C341C-15 RPP06 (GN) C2003-3 C341C-3 LPP06 (YE/BU) C2003-4





Are the resistances less than 5 ohms?

Yes
GO to D2.

No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

D2 CHECK THE DSM (Driver Seat Module) HALL-EFFECT CIRCUITS FOR A SHORT TO GROUND

- Measure the resistance between ground and:
- DSM (Driver Seat Module) C341C-3, circuit LPP06 (YE/BU), harness side.

- DSM (Driver Seat Module) C341C-15, circuit RPP06 (GN), harness side.






Are the resistances greater than 10,000 ohms?

Yes
GO to D3.

No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

D3 CHECK THE DSM (Driver Seat Module) HALL-EFFECT CIRCUITS FOR A SHORT TOGETHER

- Measure the resistance between DSM (Driver Seat Module) C341C-15, circuit RPP06 (GN), harness side and DSM (Driver Seat Module) C341C-3, circuit LPP06 (YE/BU), harness side.





Is the resistance greater than 10,000 ohms?

Yes
GO to D4.

No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

D4 CHECK THE DSM (Driver Seat Module) HALL-EFFECT CIRCUITS FOR A SHORT TO VOLTAGE

- Ignition ON.

- Measure the voltage between ground and:
- DSM (Driver Seat Module) C341C-3, circuit LPP06 (YE/BU), harness side.

- DSM (Driver Seat Module) C341C-15, circuit RPP06 (GN), harness side.






Is any voltage present?

Yes
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.

No
If DTC B1987 was retrieved, GO to Pinpoint Test B. Pinpoint Test B: Adjustable Brake Pedal Is Inoperative/Does Not Operate Correctly - Using the Adjustable Pedal Sw. (W/Memory)

For all other DTCs, INSTALL a new brake pedal and bracket. REFER to Brake Pedal and Bracket . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.