The tickRenderer is inside axis and not inside the rendererOptions.

HTML

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/jquery.jqplot.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.dateAxisRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.canvasAxisTickRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.canvasAxisLabelRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.canvasTextRenderer.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.highlighter.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.cursor.js"></script>

<script language="javascript" type="text/javascript" src="https://bitbucket.org/cleonello/jqplot/raw/b5a7796a9ebf/src/plugins/jqplot.pointLabels.js"></script>


<div id="container"></div>

CSS

#container{
    width: 500px;
    height: 100%;
    margin: auto;
}

//jquery.jqplot.css
/*rules for the plot target div.  These will be cascaded down to all plot elements according to css rules*/
.jqplot-target {
    position: relative;
    color: #666666;
    font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
    font-size: 1em;
/*    height: 300px;
    width: 400px;*/
}

/*rules applied to all axes*/
.jqplot-axis {
    font-size: 0.75em;
}

.jqplot-xaxis {
    margin-top: 10px;
}

.jqplot-x2axis {
    margin-bottom: 10px;
}

.jqplot-yaxis {
    margin-right: 10px;
}

.jqplot-y2axis, .jqplot-y3axis, .jqplot-y4axis, .jqplot-y5axis, .jqplot-y6axis, .jqplot-y7axis, .jqplot-y8axis, .jqplot-y9axis, .jqplot-yMidAxis {
    margin-left: 10px;
    margin-right: 10px;
}

/*rules applied to all axis tick divs*/
.jqplot-axis-tick, .jqplot-xaxis-tick, .jqplot-yaxis-tick, .jqplot-x2axis-tick, .jqplot-y2axis-tick, .jqplot-y3axis-tick, .jqplot-y4axis-tick, .jqplot-y5axis-tick, .jqplot-y6axis-tick, .jqplot-y7axis-tick, .jqplot-y8axis-tick, .jqplot-y9axis-tick, .jqplot-yMidAxis-tick {
    position: absolute;
    white-space: pre;
}


.jqplot-xaxis-tick {
    top: 0px;
    /* initial position untill tick is drawn in proper place */
    left: 15px;
/*    padding-top: 10px;*/
    vertical-align: top;
}

.jqplot-x2axis-tick {
    bottom: 0px;
    /* initial position untill tick is drawn in proper place */
    left: 15px;
/*    padding-bottom: 10px;*/
    vertical-align: bottom;
}

.jqplot-yaxis-tick {
    right: 0px;
    /* initial position untill tick is drawn in proper place */
    top: 15px;
/*    padding-right: 10px;*/
    text-align: right;
}

.jqplot-yaxis-tick.jqplot-breakTick {
    right: -20px;
    margin-right: 0px;
    padding:1px 5px 1px 5px;
/*    background-color: white;*/
    z-index: 2;
    font-size: 1.5em;
}

.jqplot-y2axis-tick, .jqplot-y3axis-tick, .jqplot-y4axis-tick, .jqplot-y5axis-tick, .jqplot-y6axis-tick, .jqplot-y7axis-tick, .jqplot-y8axis-tick,...

JavaScript

$(document).ready(function() {

    var ignOnStyle = {
        color: "#00FF00",
        showMarker: false,
        pointLabels: {
            location: 'n'
        },
        lineWidth: 7,
        markerOptions: {
            style: "filledCircle",
            size: 12,
        }
    };
    var ignOffStyle = {
        color: "#FF0000",
        showMarker: false,
        label: "Contact",
        lineWidth: 7
    };
    var locStyle = {
        color: "#941B80",
        label: ""
    };

    var seriesCnf = Array();
    var loc = Array();

    // add location values
    loc.push([[1340877534000, 2, 'location 1'], [1340877669000, 2, 'location 1']]);
    seriesCnf.push(locStyle);
    loc.push([[1340877779000, 2, 'location 2'], [1340877869000, 2, 'location 2']]);
    seriesCnf.push(locStyle);
    loc.push([[1340877989000, 2, 'location 1'], [1340878139000, 2, 'location 1']]);
    seriesCnf.push(locStyle);

    // add ignition values
    loc.push([[1340877534000, 1, 'off'], [1340877561000, 1, null]]);
    seriesCnf.push(ignOffStyle);
    loc.push([[1340877561000, 1, 'on'], [1340877779000, 1, null]]);
    seriesCnf.push(ignOnStyle);
    loc.push([[1340877779000, 1, 'off'], [1340877839000, 1, null]]);
    seriesCnf.push(ignOffStyle);
    loc.push([[1340877839000, 1, 'on'], [1340878019000, 1, null]]);
    seriesCnf.push(ignOnStyle);
    loc.push([[1340878019000, 1, 'off'], [1340878139000, 1, null]]);
    seriesCnf.push(ignOffStyle);

    plot1 = $.jqplot('container', loc, {
        seriesColors: ["#941B80"],
        axes: {
            xaxis: {
                renderer: $.jqplot.DateAxisRenderer,
                tickRenderer: $.jqplot.CanvasAxisTickRenderer,
                tickOptions: {
                    formatString: '%R',
                    angle: 0
                },
                pad: 0,
            },
            yaxis: {
                labelRenderer: $.jqplot.CanvasAxisLabelRenderer,
                label: 'Snelheid [km/h]',
                labelOptions: {
...