Start Here - Fault Determination - Reverse Watch 2.0

Below is the Fault Determination Guide for Reverse Watch 2.0 System.

Before attempting any repairs or diagnosis on a MAX-SAFE Reverse Watch 2.0 System, ensure the following:

• The vehicle brake system, particularly the park brake system, is in working order and maintained as per the manufacturer’s specifications. Ensure that the OEM park brake lever is in the applied position.
• The vehicle is in a safe place to work on, and the wheels are chocked.
• The batteries are fully charged, and the vehicle and system’s earth points are secure on the chassis, cabin, and engine.
• The LCD screen is powered up and showing images/logo.

It is also recommended that before attempting any repairs of the system, that all visible and accessible portions of the wiring harness, especially all wiring external to the vehicle cabin, are visually inspected for any rubbing, pinching, or wear and tear. Inspect all external wiring terminations and connectors and ensure that all are connected properly and securely.

Fault Determination

If a fault occurs within the system, this error will be displayed on one of two system components: the MAX-SAFE LCD Screen, or the Pause/Over-ride Switch LED. In the table below, normal functions are marked green, while faults are marked in red.

MAX-SAFE LCD Screen

If there is a communication fault between the LCD screen and the MAX-SAFE Reverse Watch® 2.0 system, an error screen will appear on the LCD indicating that a communication fault is present. If this error screen appears, tap on the warning symbol to open the MSB and Screen Faults screen to check what faults have been detected.

For in-field fault diagnostics of the MSB system when talking to SGESCO-MAX technical support, access the MSB and Screen Debug Data screen to relay to SGESCO-MAX technical support for diagnosis.

If the LCD displays a fault this may indicate one of several faults:

• The radar is not connected to the LCD Screen. Check that all connectors between the radar sensor, the radar sensor extension cable, and the LCD Screen are connected securely and correctly. Check for any damage to the connectors or cable. 
• No power to sensor. Check for any damage to the connectors or cable.
• CAN Communication error with sensor. The system may be installed, or the cabling may be routed, too closely to a source of electrical noise in the vehicle. Try to relocate the affected component(s) or cabling. If there is no nearby source of electrical noise, check that all cabling and connectors are connected securely, and check for any damage to the connectors or cabling.
• Data corruption in sensor. If no damage can be found on the components, connectors, or cabling; if all connectors are securely and correctly connected; and if all system components are located away from sources of electrical noise, the radar sensor data may be corrupted. If this is the case, contact SGESCO-MAX.

MAX-SAFE Pause / Override Switch

When the MAX-SAFE Pause/Over-ride Switch LED flashes red/green, this indicates that there is a fault within the over-ride wiring circuit. This fault could either be an open circuit, or there could be a short to positive present on the circuit. Check the yellow wire of the Pause / Over-ride Switch wiring for any damage.

Test the voltage of the Pause / Over-ride Switch with a voltmeter. The voltage should be equal to either 0V or the supply voltage of the vehicle. If the voltage is ~5V (±0.5V), there is an open circuit present within the switch. Replace the switch. If a fault is still occurring after replacing the switch, the wiring harness or MAX-SAFE ECU will need to be replaced.

Ensure that the mechanism of the switch clicks as per normal when used. A weak or disjointed click of the switch could indicate a damaged or deteriorating switch mechanism. If the mechanism is weakened, the switch should be replaced before any major faults occur.