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1) Follow the flowchart in T.2.1 to diagnose mirror movement problems.
2) Make sure all cables and connections are tight.
3) Remove the mirror glass according to G.5.1. Check to ensure the mirror is remote (there are motors present). Sometimes, a customer may have a
manual mirror with a remote control switch inside the truck. If this is the case, the entire assembly must be replaced if the customer wants a remote
control mirror.
4) Are the motor arms and linking components in good visual condition and function? If not, replace the appropriate part as indicated in the
flowchart.
5) Using a tester unit (or supplying power to the control cable according to T.3.1) check the mirror function from the end of the control cable at the
door (under the lower cover). If the mirror functions properly, the fault is cab-internal.
6) Using a tester unit (or supplying power to the motor connector inside the mirror head) check the function of the mirror head. If the mirror functions
at this point, but not from the control cable (under the lower cover), the problem is in the control cable. Check the connections, and if necessary
replace the control cable according to T.3.2. Always perform a continuity check (see T.3.1) on the control cable and confirm the fault before
attempting replacement.
7) If there is no continuity through the motor connector according to T.3.1, replace the motor or the mirror head assembly. To determine which must
be replaced, snip the wires for the appropriate motor about 2 1/2” from the motor connector. Put the motor leads to power—if the motor does not
function, it must be replaced. See T.2.5 for details. If the motor functions when the leads are directly connected to power, but does not function
when power is supplied to the connection, the motor connector is faulty. The mirror head assembly must be replaced. See T.2.4 for details.
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