June_2022 - 35

away and asked them to bring the car by,
so I could evaluate the situation.
When the vehicle was dropped off, a
brief history was given. The vehicle had
received a light " tap " in the left rear and
even though there was no damage to
the left rear blind spot radar, it had been
replaced at the same time as the rear bumper
cover. With this information in mind, I
performed a full system DTC scan utilizing
the Autel Ultra.
I found two current faults within the
rear corner radar (RCR) module:
* C1702:55 - Variant coding error
* C2702:54 - Control module missing
calibration
Referencing SI shows the C1702:55
fault occurs when the regional setting
has not been set. Under the main heading
for the fault, a step dictates that a " variant
coding " procedure must be performed after
module replacement using GDS. Live data
PIDs (Figure 6) were checked to confirm
this and in this case, the Autel was also able
to perform the variant coding function,
which simply asked whether the vehicle
was an automatic or manual transmission.
This cleared the first fault.
With the variant coding data PID
switching to complete, it was time to tackle
the missing calibration fault.
The DTC description for C2702:54
says. " C2702:54 is set when the installation
angle of the BCW (LH) exceeds the
permitted value during auto calibration. It
turns off the BCW switch LED and inhibits
the system operation. "
Performing more research on the system
led me to the installation and blind
spot radar unit angle correction procedures.
The procedure walks the technician
through the utilization of a plumb
bob and string line to mark the vehicle
centerline and installing and using the
blind spot radar unit fixing adaptor (special
tool: 09958-3T080) on the blind spot
radar unit and the level laser (special tool:
09958-3T070).
A digital protractor (Figure 7) is then
used to measure the angle between the
center line, and the laser beam projected
from the blind spot radar. This horizontal
angle measurement must be within 3
degrees of 54 degrees with an allowance
for use of a washer behind the mounting
tabs of the module to correct the measured
value.
The string line was laid out in preparation
for the measurements, and the
rear bumper cover was removed. Upon
removal, a preliminary visual inspection
was performed and the cause of the fault
was quite clear; the repairing technician
had a blind spot of their own when it
came to evaluating the level of damage.
The vehicle had suffered a bit more than
a light tap, and there was damage to the
mounting location (Figure 8) for the
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www.VehicleServicePros.com JUNE 2022 PROFESSIONAL TOOL & EQUIPMENT NEWS 35
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June_2022

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