Pinpoint Test R: The Stability Assist Switch Indicator Is Never/Always On: Overview

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

R1 DETERMINE THE CONDITION
- Key in ON position.
- Observe the stability assist switch indicator.
- Is the OFF indicator on the stability assist switch illuminated?
Yes

GO to R2.

No

GO to R4.
R2 CHECK THE ABS MODULE
- Key in OFF position.
- Disconnect: ABS Module C155.
- Key in ON position.
- Does the OFF indicator on the stability assist switch continue to illuminate?
Yes

GO to R3.

No

GO to R7.
R3 CHECK CIRCUIT 960 (BK/LB) FOR SHORT TO GROUND
- Key in OFF position.
- Disconnect: Stability Assist Switch C280.
- Measure the resistance between the stability assist switch C280-4, circuit 960 (BK/LB), harness side and ground.
  
  Fig 1: Measuring Resistance Between Stability Assist Switch C280-4, Circuit 960 (BK/LB)
  Courtesy of FORD MOTOR CO.
- Is the resistance less greater than 10,000 ohms?
Yes

INSTALL a new stability assist switch. REFER to TRACTION CONTROL SWITCH . TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.
R4 CHECK CIRCUIT 1003 (GY/YE) FOR AN OPEN
- Key in OFF position.
- Disconnect: Stability Assist Switch C280.
- Measure the voltage between the stability assist switch C280-6, circuit 1003 (GY/YE), harness side and ground.
  
  Fig 2: Measuring Voltage Between Stability Assist Switch C280-6, Circuit 1003 (GY/YE)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

GO to R5.

No

REPAIR the circuit. TEST the system for normal operation.
R5 CHECK CIRCUIT 960 (BK/LB) FOR AN OPEN
- Disconnect: ABS Module C155.
- Measure the resistance between the stability assist switch C280-4, circuit 960 (BK/LB), harness side and the ABS module C155-13, circuit 960 (BK/LB), harness side.
  
  Fig 3: Measuring Resistance Between Stability Assist Switch C280-4, Circuit 960 (BK/LB)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

GO to R6.

No

REPAIR the circuit. TEST the system for normal operation.
R6 CHECK THE STABILITY ASSIST SWITCH
- Connect: Stability Assist Switch C280.
- Connect a fused (5A) jumper wire between the ABS module C155-13, circuit 960 (BK/LB), harness side and ground.
  
  Fig 4: Connecting Fused (5A) Jumper Wire Between ABS Module C155-13, Circuit 960 (BK/LB)
  Courtesy of FORD MOTOR CO.
- Is the OFF indicator on the stability assist switch illuminated?
Yes

GO to R7.

No

INSTALL a new stability assist switch. REFER to TRACTION CONTROL SWITCH . TEST the system for normal operation.
R7 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect all ABS connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all ABS connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes

INSTALL a new ABS module. refer to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE . TEST the system for normal operation.

No

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self -test.