Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, URPA Control Module on 2005 ESV in Cadillac Escalade Forums; Can someone please point me in the right direction on the URPA on an ESV. Is it in the cab ...
well i dont know where the upra module itself is. but i know the wire for the urpa to diagnose the system if on the same loom as the BCM under the rear passenger seat. its only 2 wires(one green and one black) with a black clip on a smaller loom. Ive been messing with my urpa for a while so just ask way if you think i can help.
Its behind the second row seat, here is a write up from an earlier thread.
Using the 3 indicators on the rear parking assist display the system is capable of displaying diagnostic trouble codes. After the bulb check has been completed, the red outside indicator flashes to indicate a malfunction with the system. The module disables operation of the Ultrasonic Read Parking Assist (URPA) system under this condition.
On standard and ESV Escalades, the RPA module is behind the right rear seat. On the EXT Escalade, the RPA module is in a box assembly with the suspension module behind the left rear seat, attached to the seat frame.
HOW TO "ENTER" DIAGNOSTIC MODE
To enter diagnostic mode, proceed as follows:
1. Short the rear parking assist diagnostic connector to ground while the vehicle is in PARK.
2. Turn the ignition ON.
3. Place foot on the brake.
4. Shift the vehicle into REVERSE within 5 seconds. If the vehicle is not shifted into reverse within 5 seconds after turning the ignition ON, the diagnostic mode will still be initiated. However, a reverse input wiring fault will be registered as shown in the Diagnostic Indicator table below.
When the diagnostic mode is first entered, the rear parking assist display displays the amber outside indicator and the red outside indicator. Then the indicators on the rear parking assist display will display one or more of the sequences in the table below to indicate where the fault exists within the rear parking assist system. Diagnostic Indicators State/Fault LocationAmber Outside Amber Middle Red Outside
Start of Diagnostics = ON OFF ON
RR Corner Object Sensor and Wiring= ON OFF OFF
RR Middle Object Sensor and Wiring = ON ON OFF
LR Middle Object Sensor and Wiring = OFF ON ON
LR Corner Object Sensor and Wiring = OFF OFF ON
Chime Warning Wiring = OFF ON OFF
Reverse Input Wiring = OFF FLASHES OFF
Sensor Supply Voltage Circuit and = FLASHES FLASHES FLASHES
HOW TO "CLEAR" TROUBLE CODES
The rear parking assist diagnostic sequences may be cleared in one of the following ways:
5. Drive the vehicle forward at least 24 km/h (15 mph). Stop the vehicle. Turn the ignition OFF.
6. Turn the ignition ON. Place foot on the brake. Shift the vehicle into REVERSE within five seconds. Turn the ignition OFF.
The sequences will not clear if the rear parking assist diagnostic connector is grounded.
You need a paper clip for this one...
The UPRA isn't on Class II so it can't be scanned for codes. But the good news is there's a 2-pin diagnostic connector hanging off the harness near the UPRA module, and all you have to do is short the 2-pins and read the codes as follows:
- Ignition off
- Short diagnostic connector in PARK
- Ignition ON
- Apply BRAKE
- Shift into REVERSE within 5 SECONDS
The UPRA lights will flash codes. Post back what the lights do.
No lights? Check the fuse, and if still no lights either the UPRA module or wiring is bad. I assume no chimes either (if chimes and no lights, check the connector on the UPRA display).
lol, i know what you mean, i was hunting for it too and it was right there in my face. ok, so do you see the Body control module? it is a black box about 3x4" with a blue connector to it. ok the blue connector's wires are encased in a black plastic wire loom. the 2 urpa wires "branch" out of that larger loom it its own smaller black plastic loom. it might be wrapped in black tape.
the problem is when I put the car in reverse the red light flashes but there is no chime. I have taken out the four rear sensors and checked the connections and they are fine. I am guessing that it is a bad sensor but I have no clue which on it is....
finally located the module in rear cargo area. looks like my rear left sensor is out. the manual i purchased for $15 from the opening page has saved me $500 from time not spent in the shop!
Was it easy to diagnose the bad sensor? I have the same symptoms as yours. The only part of the directions that I am unclear on is step one. Is it the small black wire from the module inside the truck that you ground or do you ground each sensor as you test them?
it was very easy once I located the module itself and the small diagnostic connector. use a small piece of wire to go between the two ports, turn the ignition on, foot on the brake, and put into reverse.
although not a sales pitch, the $15 I spent on the service manual is the best money I have spent in a long time.