P0703 Jeep Grand Cherokee - Brake Switch 2 Performance | Step-by-Step Diagnosis

P0703 (Brake Switch 2 Performance) on a Jeep Grand Cherokee? This video walks through the complete 8-step factory diagnostic procedure with the wiring diagram and connector views - no guesswork, no parts cannon. When monitored: Ignition on. Set condition: When the PCM recognizes Brake Switch No.2 voltage is not equal to the applied value at the PCM when Brake Switch No.1 is applied. This could be a normal condition. If this condition is seen repeatedly by the PCM the fault is set. Cruise will not work for the rest of the key cycle. In this video: 1. Active DTC 2. (F942) Fused Ignition Switch Circuit 3. Stop Lamp Switch 4. (b16) Brake Switch No.2 Signal Circuit Shorted To Battery Voltage 5. (b16) Brake Switch No.2 Signal Circuit Open 6. (b16) Brake Switch No.2 Signal Circuit Shorted To Ground 7. (b15) Brake Switch No.1 Signal Circuit Open 8. PCM Possible causes covered: (F942) Fused Ignition Switch Output Circuit; (b16) Brake Switch NO.2 Signal Circuit Open; (b16) Brake Switch NO.2 Signal Circuit Shorted To Battery Voltage; (b16) Brake Switch NO.2 Signal Circuit Shorted To Ground; (b15) Brake Switch NO.1 Signal Circuit Open; Stop Lamp Switch; PCM. Applies to the Jeep Grand Cherokee third generation (WK, 2005-2010) with the 3.7L V6, 4.7L V8 and 5.7L HEMI V8 (and SRT-8 6.1L). Much of the diagnostic logic is shared with the related Jeep Commander (XK) of the same era. This is general information for educational purposes - always confirm against the service information for your exact vehicle.