DTC B1304-04: Electronic Power Assisted Steering System - System internal failures: Action
NOTE:
- If the DTC B1304-04 is present without any warning lamp illuminated, use the JLR approved diagnostic equipment. Clear the DTC (s) and retest. If the DTC is still present, REFER to Diagnostic Trouble Code Index - Diagnostic Trouble Code Driver Assistance Domain Controller (DADC) for any communication concerns.
- If the either of the following warnings are displayed in the IPC
message center:
- Emergency Braking and Emergency Steering not available
- Ok to drive with caution Emergency Steering not available
The warnings are not related to the power steering system. Check the Driver Assistance Domain Controller (DADC). Diagnostic Trouble Code Index - Diagnostic Trouble Code Driver Assistance Domain Controller (DADC) for any communication concerns
- Check the PSCM power and ground electrical circuits. GO to Pinpoint Test B .
- Using the JLR approved diagnostic equipment, check Live Data - Main ECU Voltage Supply (0xDD02) - Vehicle Battery Voltage (0x402A). When the vehicle is stationary, move the steering from lock to lock in 2 seconds, immediately within 10 seconds from engine crank. If the main PSCM voltage drops below 8.0 volts during the steering test, then install a new battery. Refer to: STARTUP BATTERY
- Check the battery system. Refer to: BATTERY
- Using the JLR approved diagnostic equipment, clear the DTC (s) and retest (Road test the vehicle for at least 10 minutes with a vehicle speed greater than 20 km/h (12 mph), including a full lock to lock of the steering system).
- Software update to PSCM required
- If the fault persists and the power steering warning indicator illuminates, install a new steering gear. Refer to: STEERING GEAR
- Using the JLR approved diagnostic equipment, re-configure the PSCM with the latest level software