HDC, DSC, BRAKE, AFS, Terrain Response faults

DenverSun said:

2008 RR SC

Moderators - I spent significant time researching both these forums and several other sites, not to mention putting this thread together that mutually benefits everyone. I realize there is overlap with other threads, but there is a fair amount of detailed info here. Before scolding, please take this into consideration.

My situation seems to be related to a component on a CAN BUS (high speed??):

A few weeks ago, the following 3 warning indicators displayed on instrument panel at engine start:

• Dynamic Stability Control (DSC) lamp - BLINKING AMBER
• Emergency Brake Assist - SOLID AMBER
• Adaptive Front lighting System (AFS) - BLINKING AMBER

The Main Message Center displays "HDC Fault System not available" and the Terrain Response System fault displayed on nav screen. Upon putting the vehicle in gear and moving, the Suspension Lowering message appears on the nav screen.

I have performed the following actions:

1. Battery replaced (however this was done ~ 2 months ago in advance of the problem emerging). It has since been tested several times w/ both load, no-load. I did notice that the battery was bottoming out around 12.0 - 12.1 volts. 14.4 with vehicle running. Drop to low 12.x's within 2-3 minutes. Alternator tested (pass), ground cleaned and tested (pass). No parasitic draws found. Charged overnight on 3 consecutive evenings to rule out low voltage issue, problem persisted.
2. Steering Angle Sensor replaced - As per several threads in this forum and researched wiring and CAN BUS diagrams, I decided to replace the Steering Angle Sensor. Initially all warning indicators had disappeared, but DSC and Brake warnings came back, however the AFS did *not.
3. Visited trusted Indy today. Codes cleared then pulled with fancy SNAP ON diagnostic equipment (does not have Land Rover diagnostic equipment). Lot's going on here, but here we go:

Transmission - Manual / Transaxle and Clutch​

U0126 - Lost communication with the Steering Angle Sensor Module​

​

Antilock Brakes​

C1B00 - Steering Angle Sensor​

U0428 - Invalid Data Received from Steering Angle Sensor Module​

​

All Terrain Control Module​

UO401 - Invalid Data Received From Engine Control Module / Powertrain Control Module​

UO402 - Invalid Data Received From Transmission Control Module​

UO403 - Invalid Data Received From Transfer Case Control Module​

UO416 - Invalid Data Received From Vehicle Dynamics Control Module​

UO421 - Invalid Data Received From Ride Level Control Module​

​

Ride Level Control Module​

UO416 - Invalid Data Received From Vehicle Dynamics Control Module​

U0428 - Invalid Data Received from Steering Angle Sensor Module​

​

Instrument Pack​

UO248 - Communication Malfunction with Remote Driver Utility Module​

​

Lighting Control Module - Front​

U0126 - Lost communication with the Steering Angle Sensor Module​

U1A38 - Communication Malfunction of Left Actuator​

​

Steering Angle Sensor Module​

UO300 - Internal Control Module Software Incompatibility​

U3002 - Vehicle Identification Number​

​

HVAC (Likely unrelated)​

0x1 - Left Heater Air Temperature Sensor - Open Circuit or Short to Battery​

Recent repairs in previous 6 months:

• Blower Motor replaced (complex repair)
• Battery replaced (FYI - the battery that was replaced was the original OEM based on date stamp). Note voltage comments above.

Ironies:

• The problem started when the seasons changed - Hot to cold (expansion/contraction??)
• I scheduled an appt with my Indy 2 weeks ago. BY BAD LUCK, the instrument panel had cleared by arrival time in 2 phases from leaving home to reaching Indy (errands in between)

1. 1. Initial start-up: Both the DSC and Brake warning indicators were not present, but the AFS was still blinking amber. 5 minute drive to make a planned stop on way to Indy mechanic. Vehicle off at rest for ~ 10 minutes.
2. 2. Starting vehicle after stop - The AFS warning indicator was not illuminated. No warning indicators. No HDC fault. No Terrain System faults. No suspension lowering messages seen.

Arrived at mechanic, could not replicate the issue. Codes pulled, cleared. That day I was able to raise, lower vehicle; use Terrain System. Outside temp was a bit warmer.
Next Day - All 3 warning indicators back, fault messages reappeared.


Additional Info

• Visit to INDY today pulled the above codes, and the previously disappeared AFS warning indicator reemerged.
• Problem occurs immediately. Unlike other threads, this has never happened mid-ride.
• Vehicle drives fine.
• The headlamps perform their alignment routine properly at start. However, the lights appear to be pointing to the right at all times (as noticed while driving at dark)
• Vehicle is garaged daily.
• Performed SAS manual reset test (ignition start, wheel full right then left) - No change.
• I do not have all comms software. Their website states only 2002 - 2005.

Finally - I am visiting the Land Rover dealer next week to have the Airbag recall addressed. I am fine with paying a $150 diagnostics test but I want to make sure I get my $ worth. I will mention all details in this thread. Are there any other tests or suggestions from the community?

I will follow-up with results of any suggestions and ultimately what the dealer tells me.

Thank you for your consideration.

View attachment 268818

- Scott
2008 RR SC

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