NHTSA ID Number: 10167439
Manufacturer Communication Number: PIT5365D
TSB/Document Date: 2019-11-12
Summary
This Preliminary Information communication provides information to the technician on how the radio display gets the air ambient temperature. On 1500 series trucks and all sport utility vehicle with regular production option code IO3 radio the ambient air temperature sensor is hard wired to the engine control module and then the signal goes on high speed local area network to the body control module from there on low speed local area network to the radio. On 1500 series trucks and all sport utility vehicle with regular production option code IO4, IO5, or IO6 the ambient air temperature sensor is hard wired to the engine control module and then the signal goes on high speed local area network to the body control module from there on low speed local area network to the radio then Most 50 Bus to the Human Machine Interface. On 2500/3500 series trucks production option code IO3 radio the ambient air temperature sensor is hard wired to the instrument panel cluster and then the signal goes on low speed local area network to the radio. On 2500/3500 series trucks production option code IO4, IO5, or IO6 radio the ambient air temperature sensor is hard wired to the instrument panel cluster and then the signal goes on low speed local area network to the radio then Most 50 Bus to the Human Machine Interface.
Bulletin No.: PIT5365D
Published date: 10/15/2019
Preliminary Information
PIT5365D Diagnostic Tips Ambient Temperature Display /
Information (Topology)
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Escalade Models
2015 - 2020
All
All
All
All
Silverado 1500
2014
All
All
All
All
Silverado
2015 - 2018
All
All
All
All
Silverado LD
2019
All
All
All
All
Silverado 2500/3500
2019
All
All
All
All
Suburban
2015 - 2020
All
All
All
All
Tahoe
2015 - 2020
All
All
All
All
Sierra 1500
2014
All
All
All
All
Sierra
2015 - 2018
All
All
All
All
Sierra Limited
2019
All
All
All
All
Sierra 2500/3500
2019
All
All
All
All
Yukon Models
2015 - 2020
All
All
All
All
Supersession Statement
This PI was superseded to update model years, Condition/Concern. Please discard PIT5365C
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
There has been some confusion on how the temperature reading that is displa
yed on the radio, gets
from the ambient temperature sensor to the actual radio displa
y. Depending on the model, engine
and/or radio option, it may vary. The block diagrams below should help clarify any confusi
on.
-1500 Trucks and All SUV's With IO3/IOB Radio (all engines)
Ambient Air Temperature Sensor >>> (hard wired circuits 636 and 61) >>> ECM >>> (High Speed
Lan)>>> BCM >>> (Low Speed Lan) >>> Radio tuner >>> (L
VDS Cable) >>> Radio Display
-1500 Trucks and All SUV's With IO4, IO5, or IO6 (all engines)
Ambient Air Temperature Sensor >>> (hard wired circuits 636 and 61) >>> ECM >>> (High Speed
Lan)>>> BCM >>> (Low Speed Lan) >>> Radio tuner >>> (MOST BUS
S) >>> HMI >>> (LVDS Cable)
>>> Radio Display
-2500/3500 Trucks With IOB Radio (L5P Diesel Engine only)
Ambient Air Temperature Sensor >>> (hard wired circuits 636 and 61) >>> ECM >>> (High Speed
Lan)>>> BCM >>>(LowSpeed Lan) >>> Radio tuner >>> (L
VDS Cable) >>> Radio Display
Note: Trucks equipped with the L5P Diesel engine do have a grille mounted ambient air temperature
sensor, but it is not used and is only installed so there is not an open
connector.
-2500/3500 Trucks with IO5 or IO6 (L5P Diesel Engines only)
Ambient Air Temperature Sensor >>> (hard wired circuits 636 and 61) >>> ECM >>> (High Speed
Lan)>>> BCM >>>(LowSpeed Lan) >>> Radio tuner >>> (MOST BUS
S) >>> HMI >>> (LVDS Cable)
>>> Radio Display
Note: Trucks equipped with the L5P Diesel engine do have a grille mounted ambient air temperature
sensor, but it is not used and is only installed so there is not an open
connector.
-2500/3500 Trucks With IO3/IOB Radio (Gas or LML Diesel Engines)
Ambient Air Temperature Sensor >>> (hard wired circuits 636 and 61) >>> IPC >>> (Low Speed
Lan) >>> Radio tuner >>> (LVDS Cable) >>> Radio Display
-2500/3500 Trucks with IO4, IO5, or IO6 (Gas or LML Diesel Engines)
Ambient Air Temperature Sensor >>> (hard wired circuits 636 and 61) >>> IPC >>> (Low Speed
Lan) >>> Radio tuner >>> (MOST BUSS) >>> HMI >>> (LVDS Cable) >>> Radio Display
IMPORTANT INFO FOR 2015 HD TRUCKS ONLY: Midway through the 2015 model year, the Full Size HD
Pickup trucks were updated. Theseupdated trucks are now known as 2015i trucks, and they can be
easily identified as having the "A
VF" RPO code. Any 2015i truck that is equipped with diesel engine
(RPO LML) will now have an ambient air temperature sensor
that is located in the passenger mirror
,
which is used for powertrain requirements. The 2015 6.6L diesel trucks (engine
RPO LML) built
PRIOR to the mid year change 2015i (no RPO A
VF) do not have a physical ambient air temperature
sensor in the passenger outside mirror for the powertrain requirements. The outside temperature
for powertrain requirementsis calculated by the ECM on these models.
Some early built 2015i trucks equipped with the 6.6L diesel engine (RPO LML) built before 12/14/14
use the ambient air temperature sensorlocated in the passenger mirror for the temperature
displayed on the radio, as well as HVAC and powertrain requirements. If the BCM and IPC are
reprogrammed with the latest calibrations in TIS2WEB, this will change the operation of the radio
and HVAC topology to what is shown above. The grille mounted ambient air temperature sensor will
now be used for the radio and HVAC requirements, and the passenger mirror sensor will now only
be used for powertrain requirements. Theradio outside temperature display will show "- -" if only
one of the modules (BCM or IPC) is programmed with thelatest calibrations. The other module will
need to be programmed with the latest calibration to correct the issue.
Note: For all configurations listed above, after the IPC or BCM sends the ambient air temperature
out on the Low Speed LAN buss, the HV
AC control module will use this information for HV
AC related
requirements.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.
Additional SI Keywords
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. All Rights Reserved.
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TSB/Document ID: PIT5365D
Replacement Service Bulletin Number:
MFR Communication Date: 2019-10-15
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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