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Symptom: P1703-BRAKE SIGNAL PLAUS WITH REDUNDANT CONTACT When Monitored and Set Condition: P1703-BRAKE SIGNAL PLAUS WITH REDUNDANT CONTACT When Monitored: With the ignition on. Set Condition: The ECM detects the brake switch sense circuit and brake lamp switch output circuit inputs to the ECM do not agree. NOTE: An out of adjustment brake lamp POSSIBLE CAUSES INTERMITTENT CONDITION BRAKE LAMP SWITCH - SECONDARY OPEN BRAKE LAMP SWITCH FUSED B+ CIRCUIT OPEN SECONDARY BRAKE SWITCH SIGNAL CIRCUIT SHORTED TO GROUND BRAKE LAMP SWITCH - PRIMARY OPEN SECONDARY BRAKE SWITCH GROUND CIRCUIT OPEN SECONDARY BRAKE SWITCH SIGNAL CIRCUIT OPEN PRIMARY BRAKE SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE PRIMARY BRAKE SWITCH SIGNAL CIRCUIT OPEN ENGINE CONTROL MODULE - INTERNAL ENGINE CONTROL MODULE - PRIMARY BRAKE SIGNAL ENGINE CONTROL MODULE - SECONDARY BRAKE SIGNAL TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → No → 2 Turn the ignition on. All Yes → No → 196 DRIVEABILITY - DIESEL |