CAUTION / NOTICE / HINT
NOTICE:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.
Click here
PROCEDURE
1. | CHECK CABIN |
(a) Check the cabin for any object that might interrupt radio reception or additional devices which use radio waves on the instrument panel. If such an object exists, remove it and check if the "No GPS signal" mark disappears.
HINT:
The GPS uses extremely weak radio waves originating from satellites. If the signal is interrupted by obstructions or other radio waves, the GPS may not be able to properly receive the signal.
OK:
The "No GPS signal" mark disappears.
OK | ![]() | END |
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2. | CHECK SURROUNDINGS |
(a) Check if the vehicle is in a location where GPS signal reception is poor. If the vehicle is in such a place, relocate the vehicle and check if the "No GPS signal" mark disappears.
HINT:
The GPS uses 24 satellites in 6 orbits. At any point in time, 4 satellites should be able to pinpoint your vehicle. However, GPS signals may not reach the vehicle due to influence from the surroundings, vehicle direction and time. For examples, see the following illustration.
*a | Example | *b | In a tunnel |
*c | In a building | *d | Under an overpass |
*e | On a forest or tree-lined path | *f | Between tall buildings |
*g | Under a cliff or overhang | - | - |
OK:
The "No GPS signal" mark disappears.
OK | ![]() | SYSTEM RETURNS TO NORMAL |
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3. | CHECK GPS INFORMATION (OPERATION CHECK) |
(a) Enter the "System Sensors Check" screen. Refer to Check GPS & Vehicle Sensors in Operation Check. Click here |
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(b) Check how many of the following codes appear in the "Reception number" column.
HINT:
T or P appears.
OK:
At least 3 codes appear.
OK | ![]() | REPLACE RADIO RECEIVER ASSEMBLY |
NG | ![]() | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual > Navigation System: Start Up Signal Circuit between Radio Receiver Assembly and Navigation ECU
DESCRIPTION This circuit includes the navigation ECU and radio receiver assembly. WIRING DIAGRAM PROCEDURE 1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NAVIGATION ECU) (a) Disconnect the J149 radio receiver assembly connector. (b) Disconnect the J153 navigation ECU connector. ...
Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual > Can Communication System: Check Bus 2 Lines for Short Circuit
DESCRIPTION There may be a short circuit between the bus 2 main lines and/or bus 2 branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the network gateway ECU is below 54 Ω. Symptom Trouble Area Resistance between terminals 18 (CA4H) and 17 (CA4L) of network gatew ...